Oly 45 1.8 with Pana GTC1 converter... works !!!

Started May 17, 2012 | Discussions
LMNCT
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Oly 45 1.8 with Pana GTC1 converter... works !!!
May 17, 2012

The new Telephoto converter from Panasonic, GTC1, works very well with the 45 f1.8 and creates a very light 180 mm 1.8 lens. I prefer it on the Oly rather than on the 14-42 GX lens for which it was designed.

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drpoop
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Re: Oly 45 1.8 with Pana GTC1 converter... works !!!
In reply to LMNCT, May 17, 2012

I demand samples!

LMNCT wrote:

The new Telephoto converter from Panasonic, GTC1, works very well with the 45 f1.8 and creates a very light 180 mm 1.8 lens. I prefer it on the Oly rather than on the 14-42 GX lens for which it was designed.

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azazel1024
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Re: Oly 45 1.8 with Pana GTC1 converter... works !!!
In reply to drpoop, May 17, 2012

Is it a 4x teleconverter? Or do you mean it is 180mm equivelent?

Bad news though, it is not 180mm f/1.8 equivelent, it is a 180mm f/3.6 equivelent. A 2x teleconverter results in a two stop loss of aperature. So the 45mm f/1.8 is actually a 90mm f/3.6 with a 2x teleconverter on there (I am not speaking of depth of field, I mean out right the aperature if f/3.6 with a 2x teleconverter on there).

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MAubrey
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Re: Oly 45 1.8 with Pana GTC1 converter... works !!!
In reply to azazel1024, May 17, 2012

azazel1024 wrote:

A 2x teleconverter results in a two stop loss of aperature. So the 45mm f/1.8 is actually a 90mm f/3.6 with a 2x teleconverter on there (I am not speaking of depth of field, I mean out right the aperature if f/3.6 with a 2x teleconverter on there).

That's only true when they're attached to the back of the lens. teleconverters attached to the front of a lens are an entirely different issue. Back-attaching teleconverters cause light loss because they move the lens groups further away from the sensor, but that doesn't happen in the case of ones that attach to the front.

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leo9
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Re: Oly 45 1.8 with Pana GTC1 converter... works !!!
In reply to LMNCT, May 17, 2012

LMNCT wrote:

The new Telephoto converter from Panasonic, GTC1, works very well with the 45 f1.8 and creates a very light 180 mm 1.8 lens. I prefer it on the Oly rather than on the 14-42 GX lens for which it was designed.

That's interesting! How does it attach? I though it might have some kind of bayonet mount that only fitted the 14-42mm, but perhaps it just screws onto the 45mm?

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micksh6
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Re: Oly 45 1.8 with Pana GTC1 converter... works !!!
In reply to LMNCT, May 17, 2012

Good to know. I ordered mine few days ago and it's arriving tomorrow. I bought it specifically for Oly 45mm F1.8 to make 90mm F1.8 lens. I don't even have Pana X zoom.
I will also test it on 25mm F1.4, Oly kit zoom and long telezooms.

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bab4
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Re: Oly 45 1.8 with Pana GTC1 converter... works !!!
In reply to micksh6, May 17, 2012

Need pics!

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azazel1024
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Re: Oly 45 1.8 with Pana GTC1 converter... works !!!
In reply to MAubrey, May 17, 2012

MAubrey wrote:

azazel1024 wrote:

A 2x teleconverter results in a two stop loss of aperature. So the 45mm f/1.8 is actually a 90mm f/3.6 with a 2x teleconverter on there (I am not speaking of depth of field, I mean out right the aperature if f/3.6 with a 2x teleconverter on there).

That's only true when they're attached to the back of the lens. teleconverters attached to the front of a lens are an entirely different issue. Back-attaching teleconverters cause light loss because they move the lens groups further away from the sensor, but that doesn't happen in the case of ones that attach to the front.

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--Mike

Not true in the least. The focal length with a 2x teleconverter, no matter WHERE it is placed in the optical assembly, doubles focal length. The physical Iris of the lens stays the exact same size. The 45mm lens has a 25mm Iris (45/25 = f/1.8), doubling the focal length to 90mm no matter how you do it results in a 90mm focal length, but you still have the same 25mm Iris as the Iris of the lens in this case is where the aperature blades are located (controlling the iris size). If the Iris placement where to somehow shift (which can't happen without changing the internal optics of the existing lens), the current physical obstruction of the aperature blades even when wide open would result is severe vignetting and the apertature blades would no long be able to control the light levels and DOF of the lens. The result 90mm/25mm = f/3.6.

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micksh6
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Re: Oly 45 1.8 with Pana GTC1 converter... works !!!
In reply to azazel1024, May 17, 2012

azazel1024 wrote:

The physical Iris of the lens stays the exact same size. The 45mm lens has a 25mm Iris (45/25 = f/1.8), doubling the focal length to 90mm no matter how you do it results in a 90mm focal length, but you still have the same 25mm Iris as the Iris of the lens in this case is where the aperature blades are located (controlling the iris size). If the Iris placement where to somehow shift (which can't happen without changing the internal optics of the existing lens), the current physical obstruction of the aperature blades even when wide open would result is severe vignetting and the apertature blades would no long be able to control the light levels and DOF of the lens. The result 90mm/25mm = f/3.6.

Wrong. Front element size is what matters. Front-mounted converters have larger front element that the lens. I will post pictures to demonstrate DOF and background blur with and without converter. I used Oly TCON-17 on 45mm F1.8.

The only concern with Pana converter is that from specs its front element is very close to minimum required - 50mm, maybe a bit less, so there may be some vignetting.
Wait for OP's pictures.

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micksh6
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Re: Oly 45 1.8 with Pana GTC1 converter... works !!!
In reply to bab4, May 17, 2012

bab4 wrote:

Need pics!

I hope OP is working on pictures.

I suggest comparing background blur with and without converter (apart from sharpness, etc). Meanwhile I can post pictures taken with Oly 45mm and TCON-17 (what I called 75mm F1.8 lens last year, before Oly announced it).

Pana converter must provide better background separation (and it's 3 times lighter than TCON-17).

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ginsbu
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Re: Oly 45 1.8 with Pana GTC1 converter... works !!!
In reply to micksh6, May 17, 2012
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MT
MT
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Re: Oly 45 1.8 with Pana GTC1 converter... works !!!
In reply to LMNCT, May 17, 2012

Quick question

Have you this on BOTH the 14-42 GX? Why do you prefer it on the 45mm Oly? how's the sharpness and contrast across the entire frame?

Thanks,
MTMT

LMNCT wrote:

The new Telephoto converter from Panasonic, GTC1, works very well with the 45 f1.8 and creates a very light 180 mm 1.8 lens. I prefer it on the Oly rather than on the 14-42 GX lens for which it was designed.

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Kuppenbender
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Re: Oly 45 1.8 with Pana GTC1 converter... works !!!
In reply to azazel1024, May 17, 2012

azazel1024 wrote:

Not true in the least. The focal length with a 2x teleconverter, no matter WHERE it is placed in the optical assembly, doubles focal length.

I don't think MAubrey was disputing the idea that the focal length would be doubled.

The physical Iris of the lens stays the exact same size. The 45mm lens has a 25mm Iris (45/25 = f/1.8), doubling the focal length to 90mm no matter how you do it results in a 90mm focal length, but you still have the same 25mm Iris as the Iris of the lens in this case is where the aperature blades are located (controlling the iris size). If the Iris placement where to somehow shift (which can't happen without changing the internal optics of the existing lens), the current physical obstruction of the aperature blades even when wide open would result is severe vignetting and the apertature blades would no long be able to control the light levels and DOF of the lens. The result 90mm/25mm = f/3.6.

OP didn't mention anything about vignetting. I thought that was the point of his post. The tele-adapter works with the Zuiko 45mm.

As for doubling the aperture, I was also under the impression that front-fitting adapters don't affect it.

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azazel1024
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Re: Oly 45 1.8 with Pana GTC1 converter... works !!!
In reply to ginsbu, May 17, 2012

ginsbu wrote:

More technical explanation here:

http://ianperegian.com/My_FZ35_38_Webpage/Effect_of_Teleconverters_on_Aperture.html

Okay I stand corrected. I apologize.

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ginsbu
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Re: Oly 45 1.8 with Pana GTC1 converter... works !!!
In reply to azazel1024, May 17, 2012

azazel1024 wrote:

ginsbu wrote:

More technical explanation here:

http://ianperegian.com/My_FZ35_38_Webpage/Effect_of_Teleconverters_on_Aperture.html

Okay I stand corrected. I apologize.

It's confusing stuff. I am continually needing to unconfuse myself about it. An important distinction that often trips people up is the difference between the physical aperture of a lens and its entrance pupil:
http://en.wikipedia.org/wiki/Entrance_pupil

That language isn't used in the the previous link, but the concept is relevant and the wikipedia explanation gets it across better.

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OM User
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Re: Oly 45 1.8 with Pana GTC1 converter... works !!!
In reply to ginsbu, May 17, 2012

Sounds like one of these may be just the job.
Thanks for the explanation.

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LMNCT
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Re: Oly 45 1.8 with Pana GTC1 converter... works !!!
In reply to MT, May 18, 2012

I have confused you. I am speaking in "35mm Speak". The 45 1.8 is actually a 90mm in 35 Speak...hence, 2X 90 = 180mm...and it is f 1.8. I think the 45 1.8 is sharper than the 14 - 42 GX at full extension (ie 42..or, 84 in 35 Speak). And I also prefer the 14 2.5 (which is a 28mm in 35 Speak) with the GWC1 wide converter...I am not totally in love with the 14 -42 GX.

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MT
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LMNCT
In reply to LMNCT, May 18, 2012

LMNCT,

Thanks. Actually I would love to hear you comment on how this converter performs with the 45mm 1.8. That would be 180mm equivalent at '35 speak'. I wonder how it performs at f1.8. Then f2.5.

Thanks,
MTMT

LMNCT wrote:

I have confused you. I am speaking in "35mm Speak". The 45 1.8 is actually a 90mm in 35 Speak...hence, 2X 90 = 180mm...and it is f 1.8. I think the 45 1.8 is sharper than the 14 - 42 GX at full extension (ie 42..or, 84 in 35 Speak). And I also prefer the 14 2.5 (which is a 28mm in 35 Speak) with the GWC1 wide converter...I am not totally in love with the 14 -42 GX.

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LMNCT
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Re: LMNCT
In reply to MT, May 18, 2012

The GTC1 has no effect on the sharpness of the 45 1.8. All it does is extend the range. It really is excellent because the 45 is light, so is the converter...a lightweight, tack sharp and affordable 180 f 1.8 is a great addition to anyone's kit !!!

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Gregm61
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Re: LMNCT
In reply to LMNCT, May 18, 2012

LMNCT wrote:

The GTC1 has no effect on the sharpness of the 45 1.8.

I've seen claims like this before. When the images get posted, another truth comes out. No adapter that adds optical elements to the primary lens have no affect on image quality. None. Not even the best true teleconverters. At the very least corners become degraded, but post some full resolution images and shows us that's not so.

Panasonic does make some excellent accessory lenses. No doubt that probably is the best option for doing this. When I was shooting an FZ50 I used their DMW-LW55 lens which converted the 35mm wide end to a much wider 24mm and was excellent, but not without faults. The program PTLens has a great profile for dealing with the distortion that combination produces.

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