FD to M43 focal reducer problem, also which FD lens do you suggest ?

Started 4 months ago | Questions
adygadam
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FD to M43 focal reducer problem, also which FD lens do you suggest ?
4 months ago

Hello All,

I own a Panasonic GH3 and 4 days ago took the plunge finally after a long debate on speedboosters/focal reducers and ordered a focal reducer FD to M43 from here:

Camdiox Focal Reducer FD to M43

I also ordered an adapter: Canon FD to M43 adapter

A got myself a Canon FD 50mm F1:1.4 S.S.C. lens which is amazing ! No dust specs or fungus and in excellent condition.

The adapter worked like a charm, I was able to change the aperture from F16 down to F1.4 and I believe the FF equivalent focal length would be 100mm (50mm x 2), bokeh was amazing a this makes this lens an excellent short distance portrait lens.

The problem was with the focal reducer, I was only able to stop down to F4.8, after that the aperture was the same to F16. On the contrary the adapter allowed me to stop down to F16.

I have noticed that when I mount the lens to the adapter the chrome ring will turn around 2 inches until it tightens, whereas with the focal reducer it will turn around 4/8 of an inch before it tightens.

Is this normal ? Is the focal reducer faulty ?

Apart from being unable to stop down any lower than F4.8 using the focal reducer, the focus is working alright and the FF equivalent focal length I believe is now 72mm (50mm x 0.72 x 2) with an amazing F1.0!.

I have the following native M43 lens:

Olympus Zuiko 12mm F1:2.0

Panasonic Lumix G X 12-35mm F1:2.8

Also I have the following FD lens:

Canon FD 50mm F1:1.4 S.S.C. (with adapter: 100mm F1.4, with focal reducer: 72mm F1.0)

Tokina ATX SD 80-200mm F1:2.8 (bought recently)(with adapter: 160-400mm F2.8, with focal reducer: 115-288mm F2 !)

I am thinking about buying this one:

Canon FD 35mm F1:2.0 S.S.C. (with adapter: 70mm F2.0, with focal reducer: 50mm F1.4)

What do you suggest for a close alternative to what you can get from a Voigtlander 25mm (FF=50mm) F0.95, I guess this Canon FD35mm with a focal reducer will be the best you can get on FD ?

Many thanks.

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AV Janus
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Re: FD to M43 focal reducer problem, also which FD lens do you suggest ?
In reply to adygadam, 4 months ago

Sounds to me like you might need to modify the aperture tab, either on the lens caus its to long or on the adapter side. Sand ir down to a semi-circle profile.
I will post my pics tommorow. i had to mod the adapter tab for my 58mm f1.2 FL lens

It also depends on what side is the aperture sliding ring se while you are mounting the lens.

Unfortunately FD mount us very complicated to use quickly...
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Eric Nepean
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Re: FD to M43 focal reducer problem, also which FD lens do you suggest ?
In reply to adygadam, 4 months ago

I have the Metabones focal reducer, have been a user of FD lenses since I got my Ftb in the 1970s.

adygadam wrote:

Hello All,

I own a Panasonic GH3 and 4 days ago took the plunge finally after a long debate on speedboosters/focal reducers and ordered a focal reducer FD to M43 from here:

Camdiox Focal Reducer FD to M43

I also ordered an adapter: Canon FD to M43 adapter

A got myself a Canon FD 50mm F1:1.4 S.S.C. lens which is amazing ! No dust specs or fungus and in excellent condition.

The adapter worked like a charm, I was able to change the aperture from F16 down to F1.4 and I believe the FF equivalent focal length would be 100mm (50mm x 2), bokeh was amazing a this makes this lens an excellent short distance portrait lens.

The problem was with the focal reducer, I was only able to stop down to F4.8, after that the aperture was the same to F16. On the contrary the adapter allowed me to stop down to F16.

I have noticed that when I mount the lens to the adapter the chrome ring will turn around 2 inches until it tightens, whereas with the focal reducer it will turn around 4/8 of an inch before it tightens.

Is this normal ? Is the focal reducer faulty ?

The Chrome mounting ring turns between 1 inch and 1 1/2 inches on my various bits of FD gear - the 1/2 inch you mention sounds a little short. I note that with plastic end caps, the mounting ring only turns about 1/2 inch. IMO it quite possible there is an interlock in the chrome mounting ring.

The Chrome ring actually turns on a screw thread on the lens barrel, so how far it turns depends on the thickness of the mating part on the lens mount on your Focal reducer. You could return it and argue that the mount is out of tolerance.

With FD lenses, there is a work around to your problem - in fact its my preferred way of using an FD lens on an M43 camera. On the back of the FD lenses, there are two protruding levers - one is longer than the other. With the rear of the lens facing you, slide the longer lever counterclockwise as far as it will go - towards the end of travel there is a little resistance and then it will snap into place. Now the lens aperture is always closed to the setting on the aperture ring.

On some FD lenses (newer perhaps?), the mechanism is slighly different - there is a very small lever flush to the metal surface, this locks the protruding lever at the end of its travel.

Apart from being unable to stop down any lower than F4.8 using the focal reducer, the focus is working alright and the FF equivalent focal length I believe is now 72mm (50mm x 0.72 x 2) with an amazing F1.0!.

I have the following native M43 lens:

Olympus Zuiko 12mm F1:2.0

Panasonic Lumix G X 12-35mm F1:2.8

Also I have the following FD lens:

Canon FD 50mm F1:1.4 S.S.C. (with adapter: 100mm F1.4, with focal reducer: 72mm F1.0)

Tokina ATX SD 80-200mm F1:2.8 (bought recently)(with adapter: 160-400mm F2.8, with focal reducer: 115-288mm F2 !)

I am thinking about buying this one:

Canon FD 35mm F1:2.0 S.S.C. (with adapter: 70mm F2.0, with focal reducer: 50mm F1.4)

What do you suggest for a close alternative to what you can get from a Voigtlander 25mm (FF=50mm) F0.95, I guess this Canon FD35mm with a focal reducer will be the best you can get on FD ?

Many thanks.

As you have done, I have found that the FD50mm F1.4 lens with focal reducer makes a 35mm F1.0 lens (FF equivalent FOV 72mm DOF F2.0) this quite handy. With the Metabones, the image is quite sharp.

I also have the FD135mmF2.5 which with the speedbooster becomes 96mm F 1.8 (FF Equivalent FOV 190mm DOF F3.5) Unfortunately the lens itself is not that sharp until you stop it down a few stops.

Another interesting combination would be the FD100mm F2.0, which would become 71mm F 1.4

However I have looked and I don't see any useful combos with the original lens focal length below 50mm; the native M43 lenses are better.

The best below 50mm at reasonable price would be the FD 24mm F2.0 which becomes a 17mm F1.4 lens which isn't that interesting because Olympus has a 17mm F1.8 lens, which is automatic and not to expensive, and the extra one third stop isn't that significant at 17mm.

Even if you had a bigger budget to buy the FD24mm F1.4, about $1000 used, with .71x Focal Reducer would be come 17mm F1.0 which would be interesting, but for that price you may as well buy the 17.5mm Voigtlander F0.95 in native M43 mount and get a better lens.

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Eric

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adygadam
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Re: FD to M43 focal reducer problem, also which FD lens do you suggest ?
In reply to Eric Nepean, 4 months ago

Eric Nepean wrote:

I have the Metabones focal reducer, have been a user of FD lenses since I got my Ftb in the 1970s.

adygadam wrote:

Hello All,

I own a Panasonic GH3 and 4 days ago took the plunge finally after a long debate on speedboosters/focal reducers and ordered a focal reducer FD to M43 from here:

Camdiox Focal Reducer FD to M43

I also ordered an adapter: Canon FD to M43 adapter

A got myself a Canon FD 50mm F1:1.4 S.S.C. lens which is amazing ! No dust specs or fungus and in excellent condition.

The adapter worked like a charm, I was able to change the aperture from F16 down to F1.4 and I believe the FF equivalent focal length would be 100mm (50mm x 2), bokeh was amazing a this makes this lens an excellent short distance portrait lens.

The problem was with the focal reducer, I was only able to stop down to F4.8, after that the aperture was the same to F16. On the contrary the adapter allowed me to stop down to F16.

I have noticed that when I mount the lens to the adapter the chrome ring will turn around 2 inches until it tightens, whereas with the focal reducer it will turn around 4/8 of an inch before it tightens.

Is this normal ? Is the focal reducer faulty ?

The Chrome mounting ring turns between 1 inch and 1 1/2 inches on my various bits of FD gear - the 1/2 inch you mention sounds a little short. I note that with plastic end caps, the mounting ring only turns about 1/2 inch. IMO it quite possible there is an interlock in the chrome mounting ring.

The Chrome ring actually turns on a screw thread on the lens barrel, so how far it turns depends on the thickness of the mating part on the lens mount on your Focal reducer. You could return it and argue that the mount is out of tolerance.

This is exactly what I thought, the thickness of the lens mount on the adapter is about 0.85mm and the one on the focal reducer is around 1.15mm, so I guess this is preventing the lens from rotating a further 1/2 inch to make a perfect fit ?

With FD lenses, there is a work around to your problem - in fact its my preferred way of using an FD lens on an M43 camera. On the back of the FD lenses, there are two protruding levers - one is longer than the other. With the rear of the lens facing you, slide the longer lever counterclockwise as far as it will go - towards the end of travel there is a little resistance and then it will snap into place. Now the lens aperture is always closed to the setting on the aperture ring.

On some FD lenses (newer perhaps?), the mechanism is slighly different - there is a very small lever flush to the metal surface, this locks the protruding lever at the end of its travel.

Apart from being unable to stop down any lower than F4.8 using the focal reducer, the focus is working alright and the FF equivalent focal length I believe is now 72mm (50mm x 0.72 x 2) with an amazing F1.0!.

I have the following native M43 lens:

Olympus Zuiko 12mm F1:2.0

Panasonic Lumix G X 12-35mm F1:2.8

Also I have the following FD lens:

Canon FD 50mm F1:1.4 S.S.C. (with adapter: 100mm F1.4, with focal reducer: 72mm F1.0)

Tokina ATX SD 80-200mm F1:2.8 (bought recently)(with adapter: 160-400mm F2.8, with focal reducer: 115-288mm F2 !)

I am thinking about buying this one:

Canon FD 35mm F1:2.0 S.S.C. (with adapter: 70mm F2.0, with focal reducer: 50mm F1.4)

What do you suggest for a close alternative to what you can get from a Voigtlander 25mm (FF=50mm) F0.95, I guess this Canon FD35mm with a focal reducer will be the best you can get on FD ?

Many thanks.

As you have done, I have found that the FD50mm F1.4 lens with focal reducer makes a 35mm F1.0 lens (FF equivalent FOV 72mm DOF F2.0) this quite handy. With the Metabones, the image is quite sharp.

I also have the FD135mmF2.5 which with the speedbooster becomes 96mm F 1.8 (FF Equivalent FOV 190mm DOF F3.5) Unfortunately the lens itself is not that sharp until you stop it down a few stops.

Another interesting combination would be the FD100mm F2.0, which would become 71mm F 1.4

However I have looked and I don't see any useful combos with the original lens focal length below 50mm; the native M43 lenses are better.

The best below 50mm at reasonable price would be the FD 24mm F2.0 which becomes a 17mm F1.4 lens which isn't that interesting because Olympus has a 17mm F1.8 lens, which is automatic and not to expensive, and the extra one third stop isn't that significant at 17mm.

Even if you had a bigger budget to buy the FD24mm F1.4, about $1000 used, with .71x Focal Reducer would be come 17mm F1.0 which would be interesting, but for that price you may as well buy the 17.5mm Voigtlander F0.95 in native M43 mount and get a better lens.

-- hide signature --

Eric

Thank you for your suggestions, looks like the only useful lenses would be telephoto ones as they will be extending the reach of the lens, however I am not planning on doing any very long shoots I guess the Tokina 80-200 will be more than enough for any interesting far shoots.

I have noticed that according to what you had said a 2 full stops are lost when converting to FF even though it was already gained with the speedbooster/focal reducer ?

CheersDamian

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adygadam
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Re: FD to M43 focal reducer problem, also which FD lens do you suggest ?
In reply to AV Janus, 4 months ago

AV Janus wrote:

Sounds to me like you might need to modify the aperture tab, either on the lens caus its to long or on the adapter side. Sand ir down to a semi-circle profile.
I will post my pics tommorow. i had to mod the adapter tab for my 58mm f1.2 FL lens

The adapter is working fine, the only issue is with the focal reducer adapter, I hope I can use your method to fix this otherwise I will have to return this expensive piece and opt to use just the adapter which is fine.

It also depends on what side is the aperture sliding ring se while you are mounting the lens.

Unfortunately FD mount us very complicated to use quickly...

True, I never used FD lens in my life, but learned a lot during my comparison session between the adapter and the focal reducer, I could not find any noticeable differences in regards to the mount apart from what I have mentioned on my reply to Eric.

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Rick Halle wrote:

" Keep in mind that tall buildings sway back and forth so they require faster shutter speeds."

Cheers

Damian

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Eric Nepean
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Re: FD to M43 focal reducer problem, also which FD lens do you suggest ?
In reply to adygadam, 4 months ago

adygadam wrote:

Eric Nepean wrote:

I have the Metabones focal reducer, have been a user of FD lenses since I got my Ftb in the 1970s.

adygadam wrote:

Hello All,

I own a Panasonic GH3 and 4 days ago took the plunge finally after a long debate on speedboosters/focal reducers and ordered a focal reducer FD to M43 from here:

Camdiox Focal Reducer FD to M43

I also ordered an adapter: Canon FD to M43 adapter

A got myself a Canon FD 50mm F1:1.4 S.S.C. lens which is amazing ! No dust specs or fungus and in excellent condition.

The adapter worked like a charm, I was able to change the aperture from F16 down to F1.4 and I believe the FF equivalent focal length would be 100mm (50mm x 2), bokeh was amazing a this makes this lens an excellent short distance portrait lens.

The problem was with the focal reducer, I was only able to stop down to F4.8, after that the aperture was the same to F16. On the contrary the adapter allowed me to stop down to F16.

I have noticed that when I mount the lens to the adapter the chrome ring will turn around 2 inches until it tightens, whereas with the focal reducer it will turn around 4/8 of an inch before it tightens.

Is this normal ? Is the focal reducer faulty ?

The Chrome mounting ring turns between 1 inch and 1 1/2 inches on my various bits of FD gear - the 1/2 inch you mention sounds a little short. I note that with plastic end caps, the mounting ring only turns about 1/2 inch. IMO it quite possible there is an interlock in the chrome mounting ring.

The Chrome ring actually turns on a screw thread on the lens barrel, so how far it turns depends on the thickness of the mating part on the lens mount on your Focal reducer. You could return it and argue that the mount is out of tolerance.

This is exactly what I thought, the thickness of the lens mount on the adapter is about 0.85mm and the one on the focal reducer is around 1.15mm, so I guess this is preventing the lens from rotating a further 1/2 inch to make a perfect fit ?

That's what I think -  I haven't seen you adapter, but my understanding is based on what I saw when removed the chrome ring from one of my Canon Macro extension tubes for another project.

With FD lenses, there is a work around to your problem - in fact its my preferred way of using an FD lens on an M43 camera. On the back of the FD lenses, there are two protruding levers - one is longer than the other. With the rear of the lens facing you, slide the longer lever counterclockwise as far as it will go - towards the end of travel there is a little resistance and then it will snap into place. Now the lens aperture is always closed to the setting on the aperture ring.

On some FD lenses (newer perhaps?), the mechanism is slighly different - there is a very small lever flush to the metal surface, this locks the protruding lever at the end of its travel.

Apart from being unable to stop down any lower than F4.8 using the focal reducer, the focus is working alright and the FF equivalent focal length I believe is now 72mm (50mm x 0.72 x 2) with an amazing F1.0!.

I have the following native M43 lens:

Olympus Zuiko 12mm F1:2.0

Panasonic Lumix G X 12-35mm F1:2.8

Also I have the following FD lens:

Canon FD 50mm F1:1.4 S.S.C. (with adapter: 100mm F1.4, with focal reducer: 72mm F1.0)

Tokina ATX SD 80-200mm F1:2.8 (bought recently)(with adapter: 160-400mm F2.8, with focal reducer: 115-288mm F2 !)

I am thinking about buying this one:

Canon FD 35mm F1:2.0 S.S.C. (with adapter: 70mm F2.0, with focal reducer: 50mm F1.4)

What do you suggest for a close alternative to what you can get from a Voigtlander 25mm (FF=50mm) F0.95, I guess this Canon FD35mm with a focal reducer will be the best you can get on FD ?

Many thanks.

As you have done, I have found that the FD50mm F1.4 lens with focal reducer makes a 35mm F1.0 lens (FF equivalent FOV 72mm DOF F2.0) this quite handy. With the Metabones, the image is quite sharp.

I also have the FD135mmF2.5 which with the speedbooster becomes 96mm F 1.8 (FF Equivalent FOV 190mm DOF F3.5) Unfortunately the lens itself is not that sharp until you stop it down a few stops.

Another interesting combination would be the FD100mm F2.0, which would become 71mm F 1.4

However I have looked and I don't see any useful combos with the original lens focal length below 50mm; the native M43 lenses are better.

The best below 50mm at reasonable price would be the FD 24mm F2.0 which becomes a 17mm F1.4 lens which isn't that interesting because Olympus has a 17mm F1.8 lens, which is automatic and not to expensive, and the extra one third stop isn't that significant at 17mm.

Even if you had a bigger budget to buy the FD24mm F1.4, about $1000 used, with .71x Focal Reducer would be come 17mm F1.0 which would be interesting, but for that price you may as well buy the 17.5mm Voigtlander F0.95 in native M43 mount and get a better lens.

-- hide signature --

Eric

Thank you for your suggestions, looks like the only useful lenses would be telephoto ones as they will be extending the reach of the lens, however I am not planning on doing any very long shoots I guess the Tokina 80-200 will be more than enough for any interesting far shoots.

I have noticed that according to what you had said a 2 full stops are lost when converting to FF even though it was already gained with the speedbooster/focal reducer ?

CheersDamian

I believe it works this way: (example) You start with a FD 50mm F1.4 lens. The .71x focal reducer adds a lens element, which shortens the focal length to 35mm. But the F ratio is the radio of aperture diameter to focal length, so by shortening the focal length, the F ratio changes.

For the 50mm lens alone the effective aperture was 50/1.4=35mm With the focal reducer, the maximum effective aperture has not changed, but the focal length is also 35mm. So F1.0.

Now, lots of folks wish to compare M43 lenses against lenses used in the historical 35mm film standard. Sometimes because they are very familiar with that reference, but doing this also provides a common reference for comparing lenses used on various sensors.

The diagonal of the M43 sensor is about half that of the 35mm film - the crop factor is two.

So the Field of View of the 35mm lens will be the same as that of a 70mm lens used for 35mm film.

At F1.0 the depth of field is 3 ft at 20ft, which is the same as a 70mm lens at F2.0 (check it with  http://www.dofmaster.com/dofjs.html ). This doesn't change you exposure -  your shutter speed is still determined by F1.0, your ISO and the illumination.

This isn't necessarily a bad tradeoff ... if you had a 70mm F1.0 lens on 35mm film, the DOF would be  1.5 ft at 20ft (a little tight), at 10ft your DOF would be just over 4 inches (a lot tight) ... I'd rather have F1.0 and the wider DOF.

I'm finding that even with the FD 50mm 1.4 half a stop down from wide open (for increased sharpness) + Metabones, the DOF is sometimes uncomfortable narrow.

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Eric

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Elemental Photography
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The FD 35mm f/2 is a nice lens.
In reply to adygadam, 4 months ago

I haven't used focal reducers so I can't speak to that particular combination, but the FD 35mm f/2 is quite a nice lens, with a little bit of "character" but generally optically good.
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Lumixdude
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Re: FD to M43 focal reducer problem, also which FD lens do you suggest ?
In reply to adygadam, 4 months ago

One simple answer... Breach lock lenses are a pain in the butt to adapt... If you're going to buy FD lenses, buy FDn lenses which are the newer type without the beach lock (silver ring) they're much easier to fit on an adapter.

Your issue is common to anyone who has started out with legacy lenses on Micro Four Thirds camera bodies. Just take the simple route next time and say to yourself, "you cannot mount breach lock lenses on µ4/3 bodies."

What you need to understand is that halfway through Canon's FD lens development, they got rid of the "silver ring" and that lenses without the "silver ring" are actually newer and generally although not always sharper... they are also generally double coated to reduce chromatic aberration as opposed to single coated lenses. I.E. Spectra Coated lenses versus Super Spectra Coated.

The difference is minuet on Micro Four Thirds due to the reduction in image circle which alleviates most of the CA issues and even more so minuet with a Panasonic body and automatic CA processing although it's still worthwhile buying FDn lenses as they are less of a pain in the butt to mount than their breach lock FD companions.

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adygadam
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Re: FD to M43 focal reducer problem, also which FD lens do you suggest ?
In reply to Eric Nepean, 4 months ago

Eric Nepean wrote:

adygadam wrote:

Eric Nepean wrote:

I have the Metabones focal reducer, have been a user of FD lenses since I got my Ftb in the 1970s.

adygadam wrote:

Hello All,

I own a Panasonic GH3 and 4 days ago took the plunge finally after a long debate on speedboosters/focal reducers and ordered a focal reducer FD to M43 from here:

Camdiox Focal Reducer FD to M43

I also ordered an adapter: Canon FD to M43 adapter

A got myself a Canon FD 50mm F1:1.4 S.S.C. lens which is amazing ! No dust specs or fungus and in excellent condition.

The adapter worked like a charm, I was able to change the aperture from F16 down to F1.4 and I believe the FF equivalent focal length would be 100mm (50mm x 2), bokeh was amazing a this makes this lens an excellent short distance portrait lens.

The problem was with the focal reducer, I was only able to stop down to F4.8, after that the aperture was the same to F16. On the contrary the adapter allowed me to stop down to F16.

I have noticed that when I mount the lens to the adapter the chrome ring will turn around 2 inches until it tightens, whereas with the focal reducer it will turn around 4/8 of an inch before it tightens.

Is this normal ? Is the focal reducer faulty ?

The Chrome mounting ring turns between 1 inch and 1 1/2 inches on my various bits of FD gear - the 1/2 inch you mention sounds a little short. I note that with plastic end caps, the mounting ring only turns about 1/2 inch. IMO it quite possible there is an interlock in the chrome mounting ring.

The Chrome ring actually turns on a screw thread on the lens barrel, so how far it turns depends on the thickness of the mating part on the lens mount on your Focal reducer. You could return it and argue that the mount is out of tolerance.

This is exactly what I thought, the thickness of the lens mount on the adapter is about 0.85mm and the one on the focal reducer is around 1.15mm, so I guess this is preventing the lens from rotating a further 1/2 inch to make a perfect fit ?

That's what I think - I haven't seen you adapter, but my understanding is based on what I saw when removed the chrome ring from one of my Canon Macro extension tubes for another project.

With FD lenses, there is a work around to your problem - in fact its my preferred way of using an FD lens on an M43 camera. On the back of the FD lenses, there are two protruding levers - one is longer than the other. With the rear of the lens facing you, slide the longer lever counterclockwise as far as it will go - towards the end of travel there is a little resistance and then it will snap into place. Now the lens aperture is always closed to the setting on the aperture ring.

On some FD lenses (newer perhaps?), the mechanism is slighly different - there is a very small lever flush to the metal surface, this locks the protruding lever at the end of its travel.

Apart from being unable to stop down any lower than F4.8 using the focal reducer, the focus is working alright and the FF equivalent focal length I believe is now 72mm (50mm x 0.72 x 2) with an amazing F1.0!.

I have the following native M43 lens:

Olympus Zuiko 12mm F1:2.0

Panasonic Lumix G X 12-35mm F1:2.8

Also I have the following FD lens:

Canon FD 50mm F1:1.4 S.S.C. (with adapter: 100mm F1.4, with focal reducer: 72mm F1.0)

Tokina ATX SD 80-200mm F1:2.8 (bought recently)(with adapter: 160-400mm F2.8, with focal reducer: 115-288mm F2 !)

I am thinking about buying this one:

Canon FD 35mm F1:2.0 S.S.C. (with adapter: 70mm F2.0, with focal reducer: 50mm F1.4)

What do you suggest for a close alternative to what you can get from a Voigtlander 25mm (FF=50mm) F0.95, I guess this Canon FD35mm with a focal reducer will be the best you can get on FD ?

Many thanks.

As you have done, I have found that the FD50mm F1.4 lens with focal reducer makes a 35mm F1.0 lens (FF equivalent FOV 72mm DOF F2.0) this quite handy. With the Metabones, the image is quite sharp.

I also have the FD135mmF2.5 which with the speedbooster becomes 96mm F 1.8 (FF Equivalent FOV 190mm DOF F3.5) Unfortunately the lens itself is not that sharp until you stop it down a few stops.

Another interesting combination would be the FD100mm F2.0, which would become 71mm F 1.4

However I have looked and I don't see any useful combos with the original lens focal length below 50mm; the native M43 lenses are better.

The best below 50mm at reasonable price would be the FD 24mm F2.0 which becomes a 17mm F1.4 lens which isn't that interesting because Olympus has a 17mm F1.8 lens, which is automatic and not to expensive, and the extra one third stop isn't that significant at 17mm.

Even if you had a bigger budget to buy the FD24mm F1.4, about $1000 used, with .71x Focal Reducer would be come 17mm F1.0 which would be interesting, but for that price you may as well buy the 17.5mm Voigtlander F0.95 in native M43 mount and get a better lens.

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Eric

Thank you for your suggestions, looks like the only useful lenses would be telephoto ones as they will be extending the reach of the lens, however I am not planning on doing any very long shoots I guess the Tokina 80-200 will be more than enough for any interesting far shoots.

I have noticed that according to what you had said a 2 full stops are lost when converting to FF even though it was already gained with the speedbooster/focal reducer ?

CheersDamian

I believe it works this way: (example) You start with a FD 50mm F1.4 lens. The .71x focal reducer adds a lens element, which shortens the focal length to 35mm. But the F ratio is the radio of aperture diameter to focal length, so by shortening the focal length, the F ratio changes.

For the 50mm lens alone the effective aperture was 50/1.4=35mm With the focal reducer, the maximum effective aperture has not changed, but the focal length is also 35mm. So F1.0.

Now, lots of folks wish to compare M43 lenses against lenses used in the historical 35mm film standard. Sometimes because they are very familiar with that reference, but doing this also provides a common reference for comparing lenses used on various sensors.

The diagonal of the M43 sensor is about half that of the 35mm film - the crop factor is two.

So the Field of View of the 35mm lens will be the same as that of a 70mm lens used for 35mm film.

At F1.0 the depth of field is 3 ft at 20ft, which is the same as a 70mm lens at F2.0 (check it with http://www.dofmaster.com/dofjs.html ). This doesn't change you exposure - your shutter speed is still determined by F1.0, your ISO and the illumination.

This is very interesting indeed, looks like that even a tracking for a slow moving subject with Voigtlander 25mm F0.95 wide open is a pain at a distance of 8ft giving you clearance 1 ft.

Thanks for the link.

This isn't necessarily a bad tradeoff ... if you had a 70mm F1.0 lens on 35mm film, the DOF would be 1.5 ft at 20ft (a little tight), at 10ft your DOF would be just over 4 inches (a lot tight) ... I'd rather have F1.0 and the wider DOF.

I'm finding that even with the FD 50mm 1.4 half a stop down from wide open (for increased sharpness) + Metabones, the DOF is sometimes uncomfortable narrow.

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Eric

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Damian

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adygadam
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Is The Canon FD 35mm f/2 radioactive ?
In reply to Elemental Photography, 4 months ago

Elemental Photography wrote:

I haven't used focal reducers so I can't speak to that particular combination, but the FD 35mm f/2 is quite a nice lens, with a little bit of "character" but generally optically good.
--
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I guess that for filming this would be a nice lens as it translates with the focal reducer to an FF 50mm lens.

I wonder if the one I want to buy would be radioactive ?

Canon FD 35mm F2 S.S.C with a min aperture of F22

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Re: FD to M43 focal reducer problem, also which FD lens do you suggest ?
In reply to Lumixdude, 4 months ago

Lumixdude wrote:

One simple answer... Breach lock lenses are a pain in the butt to adapt... If you're going to buy FD lenses, buy FDn lenses which are the newer type without the beach lock (silver ring) they're much easier to fit on an adapter.

This is what I bought

Canon FD 50mm F1.4 Mounting side

Canon FD 50mm F1.4 Front

Is that lens what you refer to as FDn ? Looks like it does not have a chrome ring however it still has the same mounting mechanism ?

Your issue is common to anyone who has started out with legacy lenses on Micro Four Thirds camera bodies. Just take the simple route next time and say to yourself, "you cannot mount breach lock lenses on µ4/3 bodies."

What you need to understand is that halfway through Canon's FD lens development, they got rid of the "silver ring" and that lenses without the "silver ring" are actually newer and generally although not always sharper... they are also generally double coated to reduce chromatic aberration as opposed to single coated lenses. I.E. Spectra Coated lenses versus Super Spectra Coated.

Is S.S.C lens a good choice ? according to Wikipedia the newer ones got not S.S.C marking however they are multi-coated, the main question is how to distinguish the newer ones with multi-coating when they are not marked clearly ? is the absence of a chrome ring the main reference to a newer lens with improved coating ?

The difference is minuet on Micro Four Thirds due to the reduction in image circle which alleviates most of the CA issues and even more so minuet with a Panasonic body and automatic CA processing although it's still worthwhile buying FDn lenses as they are less of a pain in the butt to mount than their breach lock FD companions.

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I am experiencing sometimes a slight purple fringing on my Canon FD 50mm F1.4 wide open when shooting in a contrasting setup (i.e. a subject near a white curtain window)

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Damian

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Re: FD to M43 focal reducer problem, also which FD lens do you suggest ?
In reply to adygadam, 4 months ago

I have that same FD50mm lovely lens, but plain M43 adaptor.  I went for the Minolta MD focal reducer as simpler mount and nice choice of lenses.  Trouble is now I keep getting old MD ones with fungus from a well know auction site! Grrr.

There is a nice FD zoom 35-70 F4 constant option.

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Re: FD to M43 focal reducer problem, also which FD lens do you suggest ?
In reply to adygadam, 4 months ago

The way to differentiate FD lenses from FDn ("new" FD) lenses is that they don't have the silver ring around them. This is a locking mechanism to keep dust out on FD cameras, but it doesn't function as well as it should when you place these kinds of lenses on an adapter.

FDn lenses are generally SSC as opposed to SC lenses, SSC lenses will have better contrast and generally reduced lens flare. The other way of getting an SSC lens as opposed to an SC lens is to look for the lenses with a faster aperture. Generally the faster the aperture, the better the quality of glass.

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Re: FD to M43 focal reducer problem, also which FD lens do you suggest ?
In reply to MFiftysomething, 4 months ago

MFiftysomething wrote:

I have that same FD50mm lovely lens, but plain M43 adaptor. I went for the Minolta MD focal reducer as simpler mount and nice choice of lenses. Trouble is now I keep getting old MD ones with fungus from a well know auction site! Grrr.

Before I decided on going the FD lenses route I had researched the web for the best reserved legacy lens in regards to dust, scratches and fungus. I had found narrowed my options to:

Canon FD: I might get a Canon 5d Mark IV in the future so maybe this is a good choice with an adapter

Nikon G: like this option but confused the hell out of me

M42: offers cheaper lens for telephoto range

I found that I can get decent near perfect condition considering their age in the Canon FD range, M42 lenses tens to rarely get sold free of all the three annoying imperfections.

There is a nice FD zoom 35-70 F4 constant option.

This lens could with the focal reducer become 25-50mm F2.8 which I already got the range 12-35mm covered with my Panasonic G X lens F2.8.

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chad515
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Re: FD to M43 focal reducer problem, also which FD lens do you suggest ?
In reply to adygadam, 4 months ago

The lens in that picture is an old FD, not a new FD (aka FDn) lens. You can tell by the silver locking ring on the back of the lens. FDn lenses don't have that ring, and you mount them by twisting the lens itself (similar to how you mount MFT lenses). While they are different to work with, FDn and old FD lenses are compatible and use the same adapter.

I tend to seek out FDn lenses, as they are often lighter and have improved coatings, but old FD lenses can be just as good optically (especially if they're S.S.C. coated). I've never had a problem with an old FD lens, but I've also never used a focal reducer.

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Re: FD to M43 focal reducer problem, also which FD lens do you suggest ?
In reply to Lumixdude, 4 months ago

Lumixdude wrote:

The way to differentiate FD lenses from FDn ("new" FD) lenses is that they don't have the silver ring around them. This is a locking mechanism to keep dust out on FD cameras, but it doesn't function as well as it should when you place these kinds of lenses on an adapter.

FDn lenses are generally SSC as opposed to SC lenses, SSC lenses will have better contrast and generally reduced lens flare. The other way of getting an SSC lens as opposed to an SC lens is to look for the lenses with a faster aperture. Generally the faster the aperture, the better the quality of glass.

Sound advice, my main move to use legacy lens was actually to experience maximum available aperture for the least amount of bucks, in addition to trying a legacy lens on new digital "modern" camera body.

The only camera I could experiment with when I was kid was my dad's Zenit with Helios 44-2 lens, he had always managed to get a good shots with this combo whatever the lighting conditions.

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Re: FD to M43 focal reducer problem, also which FD lens do you suggest ?
In reply to adygadam, 4 months ago

The problem is M mount lenses are expensive due to the presence of Leica digital rangefinders, and Russian lenses, particularly copies of Zeiss lenses are fairly overrated in comparison to their non-Russian copies.

The benefit you get with FD lenses is that they're all sharp, and due to the image circle of Micro Four Thirds you're getting the best part of the lens, the centre of it. You can also look at Olympus OM mount lenses, Minolta MD, and Konica AR lenses which are all cheap, sharp, and relatively fast.

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Re: FD to M43 focal reducer problem, also which FD lens do you suggest ?
In reply to chad515, 4 months ago

chad515 wrote:

The lens in that picture is an old FD, not a new FD (aka FDn) lens. You can tell by the silver locking ring on the back of the lens. FDn lenses don't have that ring, and you mount them by twisting the lens itself (similar to how you mount MFT lenses). While they are different to work with, FDn and old FD lenses are compatible and use the same adapter.

I tend to seek out FDn lenses, as they are often lighter and have improved coatings, but old FD lenses can be just as good optically (especially if they're S.S.C. coated). I've never had a problem with an old FD lens, but I've also never used a focal reducer.

I received the "normal" adapter and experimented with the lens.

When I got the focal reducer today it was exciting to get full stop of light in addition to reducing the focal length, however I was shocked to learn that I cant stop it down any further than F4.8 which annoyed me a lot considering I paid 4x times the adaptor cost.

I am debating whether I should return the focal reducer or wait until I get an FDn lens, or even live with it ?

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Tom Caldwell
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Re: FD to M43 focal reducer problem, also which FD lens do you suggest ?
In reply to AV Janus, 4 months ago

AV Janus wrote:

Sounds to me like you might need to modify the aperture tab, either on the lens caus its to long or on the adapter side. Sand ir down to a semi-circle profile.
I will post my pics tommorow. i had to mod the adapter tab for my 58mm f1.2 FL lens

It also depends on what side is the aperture sliding ring se while you are mounting the lens.

Unfortunately FD mount us very complicated to use quickly...
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Rick Halle wrote:

" Keep in mind that tall buildings sway back and forth so they require faster shutter speeds."

None of the FL lenses will fit the Zhongyi or its derivatives except the FL 35mm f2.5 with the hump back which actually slips straight on (accident?) but will not fit the RJ (ever). However all other FD/FL lenses will fit straight on to the more roomy RJ design. A small flat filed into the FL lens aperture rod will allow them to be mounted on the Zhongyi.

Mounting FD/FL lenses is an acquired skill.

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adygadam
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Re: FD to M43 focal reducer problem, also which FD lens do you suggest ?
In reply to Lumixdude, 4 months ago

Lumixdude wrote:

The problem is M mount lenses are expensive due to the presence of Leica digital rangefinders, and Russian lenses, particularly copies of Zeiss lenses are fairly overrated in comparison to their non-Russian copies.

The benefit you get with FD lenses is that they're all sharp, and due to the image circle of Micro Four Thirds you're getting the best part of the lens, the centre of it.

I am more interested in focal reducers due to the fact that you can maximize the affective aperture.

You can also look at Olympus OM mount lenses, Minolta MD, and Konica AR lenses which are all cheap, sharp, and relatively fast.

Looks like I have more options to explore !

I had searched ebay and Konica AR 52mm F1.8 with an "excellent" condition is selling for peanuts !

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Damian

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