Converted my 15-30mmEX to Canon EOS....

[JW PHOTO]

I just took an old 70-300mm and ripped the EOS mount and electrical contact plate off and then did the same on my Sigma SA 15-30mm EX. Swap complete and it works like a champ on my Canon 5D MKI. In Fact it even focuses more accurately on the 5D than on my SD14 or SD9. Now I want to do the same to one of my 24-70mm EX lenses and my 70-200mm f2.8EX Sigma. I'm just wondering if I can just buy the parts from Sigma instead of cannibalizing another Sigma EOS mount lens. Does anybody know if I can "buy direct" from Sigma or do you have to be an authorized repairman. I ran into a problem buying parts from Canon many years ago and had to go through a local repairman to get the parts I needed. Maybe it's changed now, but it used to be hard to obtain factory replacement parts. My fingers are crossed! Does anyone know? Alf?

 

[little laker]

it even focuses more accurately on the 5D than on my SD14 or SD9.

This makes sense to me.

From what I understand it's usually the body which isn't calibrated to focus properly.
Not a problem with the lens.

Sorry I can't help you with anything, but good luck.

--
The masterpiece is created by the artist, not the camera.
http://www.bcscenicwonder.com

http://studiostu.bcscenicwonder.com/

 

[JW PHOTO]

it even focuses more accurately on the 5D than on my SD14 or SD9.

This makes sense to me.
From what I understand it's usually the body which isn't calibrated
to focus properly.
Not a problem with the lens.

That's pretty much what I thought, but was still surprised by the results. The lens does well on the 5D and I needed a cheap wide angle. When I say cheap, I mean I didn't have to shell out any nickles to get it as I already had it. I'm going to do the same to my Sigma 70-200mm f2.8EX and one of my Sigma 24-70mm f2.8EX lenses, but keep my Sigma 70mm f2.8 Macro for my SD9/14. I like using off-brand lenses on the SD9/14 and will stick with them.

Sorry I can't help you with anything, but good luck.

--
The masterpiece is created by the artist, not the camera.
http://www.bcscenicwonder.com

http://studiostu.bcscenicwonder.com/

 

[a20010494]

it took a lot of time and effort (and a broken ir filter) to get the focus at it's 100%. At least, with my only af glass.
--
http://www.flickr.com/photos/aguadeloco

 

[JW PHOTO]

it took a lot of time and effort (and a broken ir filter) to get the
focus at it's 100%. At least, with my only af glass.

Are you talking about adjusting focus on an SDxx camera? I almost broke the IR filter in my SD14 when I tried a Pentax 28mm f3.5 M42 lens on it. Gotta watch those IR filters!

--
http://www.flickr.com/photos/aguadeloco

 

[Torchwood]

andit worked perfectly but front focussed by a mile -- Given that I used the Baytonet and connector from a crash damaged EOS version of the same lens, it had to work - these things DO vary in calibration, its not just the body - you got lucky John.. I'm going to try my other 70-300 SA as a Canon and see what happens

--
--------> Adam-T

Please ignore the Typos, I'm the world's worst Typist

 

[Torchwood]

using the same mount I tried on the other one and its OK !! .. so some lenses may have to go into Sigma after conversion for re-calibration

--
--------> Adam-T

Please ignore the Typos, I'm the world's worst Typist

 

[JW PHOTO]

using the same mount I tried on the other one and its OK !! .. so
some lenses may have to go into Sigma after conversion for
re-calibration

Shucks! I was hoping it wasn't just luck Adam. I'm kind of worried about the 70-200mm EX 'cause she doesn't focus perfect on either the SD9 or the SD14 and might not on the Canon 5D either. I think I'm not going to worry about buying mount plates or electrical contact plates from Sigma and just hunt for junk Sigma lenses in EOS mount. I have converted a few the other way(from Canon EOS to Sigma SA), but this is the first one I switched from Sigma SA to Canon EOS and was worried about the "chip" for aperture communications with the camera, but it was okay and everything worked perfect on the 5D. I sure would like to know what Sigma adjust inside a lens to get perfect focus? When I had the plate off I searched the inside as much as I could see and saw no adjustment screw or whatever. I wonder how they do it. JohnW

--
--------> Adam-T

Please ignore the Typos, I'm the world's worst Typist

 

[Torchwood]

Shucks! I was hoping it wasn't just luck Adam. I'm kind of worried
about the 70-200mm EX 'cause she doesn't focus perfect on either the
SD9 or the SD14 and might not on the Canon 5D either.

I doubt it will on anything, they're always a bit "Shuffly" regarding AF when shooting at F2.8 and you need to take many shots to make sure you got it - even the newest DG Macro-II version

I'd buy the proper Bayonet, connector and inner Bezel from Sigma, you may need Bezel screws too as with the 70-300, they're a totally different length

--
--------> Adam-T

Please ignore the Typos, I'm the world's worst Typist

 

[JW PHOTO]

Shucks! I was hoping it wasn't just luck Adam. I'm kind of worried
about the 70-200mm EX 'cause she doesn't focus perfect on either the
SD9 or the SD14 and might not on the Canon 5D either.

I doubt it will on anything, they're always a bit "Shuffly" regarding
AF when shooting at F2.8 and you need to take many shots to make sure
you got it - even the newest DG Macro-II version
I'd buy the proper Bayonet, connector and inner Bezel from Sigma, you
may need Bezel screws too as with the 70-300, they're a totally
different length

Good advice Adam. I'll see about ordering them from Sigma. Do I just contact Sigma USA and ask for parts or what. JohnW

--
--------> Adam-T

Please ignore the Typos, I'm the world's worst Typist

 

[Arky]

Shucks! I was hoping it wasn't just luck Adam. I'm kind of worried
about the 70-200mm EX 'cause she doesn't focus perfect on either the
SD9 or the SD14 and might not on the Canon 5D either.

I doubt it will on anything, they're always a bit "Shuffly" regarding
AF when shooting at F2.8 and you need to take many shots to make sure
you got it - even the newest DG Macro-II version
I'd buy the proper Bayonet, connector and inner Bezel from Sigma, you
may need Bezel screws too as with the 70-300, they're a totally
different length

Good advice Adam. I'll see about ordering them from Sigma. Do I
just contact Sigma USA and ask for parts or what. JohnW

Last I heard, Sigma USA doesn't sell repair parts.
You need to order your parts from C.R.I.S. http://criscam.com/

 

[JW PHOTO]

Shucks! I was hoping it wasn't just luck Adam. I'm kind of worried
about the 70-200mm EX 'cause she doesn't focus perfect on either the
SD9 or the SD14 and might not on the Canon 5D either.

I doubt it will on anything, they're always a bit "Shuffly" regarding
AF when shooting at F2.8 and you need to take many shots to make sure
you got it - even the newest DG Macro-II version
I'd buy the proper Bayonet, connector and inner Bezel from Sigma, you
may need Bezel screws too as with the 70-300, they're a totally
different length

Good advice Adam. I'll see about ordering them from Sigma. Do I
just contact Sigma USA and ask for parts or what. JohnW

Last I heard, Sigma USA doesn't sell repair parts.
You need to order your parts from C.R.I.S. http://criscam.com/

That's exactly the kind of information I was looking for. Arky, you get a gold star for that. Thanks, JohnW

--

 

[JW PHOTO]

I've contacted both Sigma USA and C.R.I.S. Camera and will wait and see what happens. JohnW

 

[a20010494]

Yes, while adjusting focus on my camera. It's an easy task but it has it's risks.

I have one question, sigma's canon has the same registry?

it took a lot of time and effort (and a broken ir filter) to get the
focus at it's 100%. At least, with my only af glass.

Are you talking about adjusting focus on an SDxx camera? I almost
broke the IR filter in my SD14 when I tried a Pentax 28mm f3.5 M42
lens on it. Gotta watch those IR filters!

--
http://www.flickr.com/photos/aguadeloco

--
http://www.flickr.com/photos/aguadeloco

 

[JW PHOTO]

Yes, while adjusting focus on my camera. It's an easy task but it has
it's risks.

I have one question, sigma's canon has the same registry?

Yes, Canon and Sigma are exactly the same. It's to bad the darn lens mounts aren't the same. By that I mean same as in "Canon". They made the the Kodak digital full frame SLR/C (EOS lens mount) camera for Kodak so they could as just as well made the SD cameras with the EOS mount.

it took a lot of time and effort (and a broken ir filter) to get the
focus at it's 100%. At least, with my only af glass.

Are you talking about adjusting focus on an SDxx camera? I almost
broke the IR filter in my SD14 when I tried a Pentax 28mm f3.5 M42
lens on it. Gotta watch those IR filters!

--
http://www.flickr.com/photos/aguadeloco

--
http://www.flickr.com/photos/aguadeloco

 

[JW PHOTO]

We do not recommend converting a lens from one manufacture to another because generally it is more involved than what you have listed below.

The first problem that this lens poses is that there are 4 different versions of the 70-200mm 2.8 HSM EX.

Second, the main circuits are different as well and we cannot sell the Main Circuit, because 2 of the 4 models have a 'Re-writable' circuit and cannot be exchanged without re-programming after installation.

Third, there are different parts inside the lens as well that have different contacts and reading signals compared from the Canon to the Sigma.

It would be better to invest in a lens that is designed for the Canon mount to insure consistent performance.

Respectfully,
Lynda Turnbow
C.R.I.S. Camera Services
250 N. 54th Street
Chandler, AZ 85226
480-940-1103 ext #101
480-940-1329 fax

 

[jasonh_1]

Dang.

I was hoping to be able to convert some Canon lenses to SA, but if they don't want to sell the parts to do it....

 

[Torchwood]

We do not recommend converting a lens from one manufacture to another
because generally it is more involved than what you have listed below.

they have to say that to cover themselves, if they sell parts and the lens doesn't focus properly then some may take action - sad but true......

the Main Circuit, because 2 of the 4 models have a 'Re-writable'
circuit and cannot be exchanged without re-programming after
installation.

This is perfectly true but it doesn't always mean that the one you're re-using isn't set OK - the 70-200 APO DGs I did are re-writable and one AF'd fine and one FF'd on a Canon camera ..

Third, there are different parts inside the lens as well that have
different contacts and reading signals compared from the Canon to the
Sigma.

Hmmm. dunno about HSM Lenses of course, we've only done Micromotor ones between us (your 15-30 and my 70-300) but I can't see why it'd be much if any different

It would be better to invest in a lens that is designed for the Canon
mount to insure consistent performance.

Preferably a Canon 70-200 F4L IS ;-)

I guess they'd sell you the parts to repair a crash damaged one ;-)

--
--------> Adam-T

Please ignore the Typos, I'm the world's worst Typist

 

[JW PHOTO]

We do not recommend converting a lens from one manufacture to another
because generally it is more involved than what you have listed below.

they have to say that to cover themselves, if they sell parts and the
lens doesn't focus properly then some may take action - sad but
true......

That's what I figured also and sent a reply back stating that I needed the parts.

the Main Circuit, because 2 of the 4 models have a 'Re-writable'
circuit and cannot be exchanged without re-programming after
installation.

This is perfectly true but it doesn't always mean that the one you're
re-using isn't set OK - the 70-200 APO DGs I did are re-writable and
one AF'd fine and one FF'd on a Canon camera ..

It might be true what they are saying, but I'd like to find it out myself.

Third, there are different parts inside the lens as well that have
different contacts and reading signals compared from the Canon to the
Sigma.

Hmmm. dunno about HSM Lenses of course, we've only done Micromotor
ones between us (your 15-30 and my 70-300) but I can't see why it'd
be much if any different

Me either, but like I said, I'd like to find out myself......

It would be better to invest in a lens that is designed for the Canon
mount to insure consistent performance.

Preferably a Canon 70-200 F4L IS ;-)

True, but I have no real complaints about the optical quality of my 70-200mm Siggy. I wish it were better at f2.8, but it's not terrible.

I guess they'd sell you the parts to repair a crash damaged one ;-)

I ask her to sell me the parts anyway and if it didn't work I'd just make it a Sigma SA mount again. I sent the reply before I posted their reply here so I should here something back shortly. JohnW

--
--------> Adam-T

Please ignore the Typos, I'm the world's worst Typist

 

[Arky]

We do not recommend converting a lens from one manufacture to another
because generally it is more involved than what you have listed below.

The first problem that this lens poses is that there are 4 different
versions of the 70-200mm 2.8 HSM EX.

Second, the main circuits are different as well and we cannot sell
the Main Circuit, because 2 of the 4 models have a 'Re-writable'
circuit and cannot be exchanged without re-programming after
installation.

Third, there are different parts inside the lens as well that have
different contacts and reading signals compared from the Canon to the
Sigma.

It would be better to invest in a lens that is designed for the Canon
mount to insure consistent performance.

Respectfully,
Lynda Turnbow
C.R.I.S. Camera Services
250 N. 54th Street
Chandler, AZ 85226
480-940-1103 ext #101
480-940-1329 fax

--

I have never converted a 70-200 2.8 HSM EX so I can't say for sure what problems you may encounter with that lens.

I have converted my SA mount 100-300 f/4 HSM EX, 80-400 OS EX, 28mm f/1.8 EX and 50mm 2.8 EX to EOS mount. All work normally, no AF problems with any of those lenses on my Canon cameras or my converted SD14.
-Jerry