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Rolf
Joined: 02 May 2009 Posts: 4123 Location: NRW/Germany
Expire: 2015-12-26
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Posted: Mon Jan 10, 2011 9:59 pm Post subject: Leica-R to Pentax bayonet |
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Rolf wrote:
Hi,
does anyone has experiences with such a bayonet.
Until end of last year Leitax offers this solution exclusively, but in the meantime there are few other sellers from HK/China on the market for a fraction of the costs.
Thanks for your assistance.
_________________ Rolf |
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Attila
Joined: 24 Feb 2007 Posts: 57865 Location: Hungary
Expire: 2025-11-18
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Posted: Mon Jan 10, 2011 10:17 pm Post subject: |
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Attila wrote:
I bought cheap Chinese made one , it is perfect on G1 with Pentax adapter. _________________ -------------------------------
Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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Rolf
Joined: 02 May 2009 Posts: 4123 Location: NRW/Germany
Expire: 2015-12-26
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Posted: Mon Jan 10, 2011 10:22 pm Post subject: |
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Rolf wrote:
Not sure that we talk about the same thing Attila.
I mean this one - for example
Click here to see on Ebay.de
_________________ Rolf |
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Spotmatic
Joined: 18 Aug 2008 Posts: 4045 Location: Netherlands
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Posted: Mon Jan 10, 2011 10:25 pm Post subject: |
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Spotmatic wrote:
Interesting. I should finally buy myself a Leica Summicron-R 50/2 to test this solution out myself. I always wanted to have a Leica lens; maybe this is the perfect opportunity. _________________ Peter - Moderator
Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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pich900
Joined: 10 Jun 2007 Posts: 1745 Location: The Netherlands/Zwolle
Expire: 2012-12-27
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Posted: Mon Jan 10, 2011 10:30 pm Post subject: |
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pich900 wrote:
Spotmatic wrote: |
Interesting. I should finally buy myself a Leica Summicron-R 50/2 to test this solution out myself. I always wanted to have a Leica lens; maybe this is the perfect opportunity. |
Peter, if you you want to try before to buy, you can just buy an adapter and try one of my Leica lenses ... _________________ All my lenses are for sale, nikkor, Angenieux, Zeiss etc.....
Regards,
Pascal
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Nikon D700 |
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Spotmatic
Joined: 18 Aug 2008 Posts: 4045 Location: Netherlands
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Posted: Mon Jan 10, 2011 10:32 pm Post subject: |
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Spotmatic wrote:
pich900 wrote: |
Spotmatic wrote: |
Interesting. I should finally buy myself a Leica Summicron-R 50/2 to test this solution out myself. I always wanted to have a Leica lens; maybe this is the perfect opportunity. |
Peter, if you you want to try before to buy, you can just buy an adapter and try one of my Leica lenses ... |
Thanks for the offer, Pascal! But you do know that this solution requires the original mount to be replaced with a new one with K bayonet??? _________________ Peter - Moderator
Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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pich900
Joined: 10 Jun 2007 Posts: 1745 Location: The Netherlands/Zwolle
Expire: 2012-12-27
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Posted: Mon Jan 10, 2011 11:04 pm Post subject: |
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pich900 wrote:
Spotmatic wrote: |
pich900 wrote: |
Spotmatic wrote: |
Interesting. I should finally buy myself a Leica Summicron-R 50/2 to test this solution out myself. I always wanted to have a Leica lens; maybe this is the perfect opportunity. |
Peter, if you you want to try before to buy, you can just buy an adapter and try one of my Leica lenses ... |
Thanks for the offer, Pascal! But you do know that this solution requires the original mount to be replaced with a new one with K bayonet??? |
Yes I know, where is the prb? _________________ All my lenses are for sale, nikkor, Angenieux, Zeiss etc.....
Regards,
Pascal
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Nikon D700 |
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Attila
Joined: 24 Feb 2007 Posts: 57865 Location: Hungary
Expire: 2025-11-18
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Posted: Mon Jan 10, 2011 11:26 pm Post subject: |
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Attila wrote:
I confirm I did talk about this one.
I bought it because I had Pentax helicoid + bellow and I did wish to use Leica 100 f4 bellow head lens. _________________ -------------------------------
Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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Rolf
Joined: 02 May 2009 Posts: 4123 Location: NRW/Germany
Expire: 2015-12-26
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Posted: Tue Jan 11, 2011 7:05 am Post subject: |
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Rolf wrote:
Ok guys, thanks for the comments.
I ordered a bayonet yesterday evening. Delivery time approx. 10 days to Germany. Will remove at one of my Leica lenses (maybe the 2/50) the F-mount and replace it with the Pentax bayonet. The rest of the conversion is already done at the moment.
Will post here in this thread some samples. Stay tuned !
_________________ Rolf |
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BRunner
Joined: 29 Jul 2009 Posts: 705 Location: Czech Republic
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Posted: Tue Jan 11, 2011 8:08 am Post subject: |
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BRunner wrote:
I'm using these "cheap" Pentax Chinese mounts. No problem at all with any of my lenses. Even the APO-Macro-Elmarit 2.8/100 with 10 screws is possible to convert. Machining quality is very good. _________________ .: APO-Maniac :. |
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Rolf
Joined: 02 May 2009 Posts: 4123 Location: NRW/Germany
Expire: 2015-12-26
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Posted: Tue Jan 11, 2011 8:59 am Post subject: |
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Rolf wrote:
Thanks for your comment.
I use for the Leica to Nikon conversion Chinese bayonets too. Normally it is not the question of material etc - the question is what is with tolerances ?
But I must say that in the past I have had focus problems with the original Lxxxxx bayonets too. Sometimes front focus, sometimes back focus when the focus indicator lamp is on.
With Live view it is at all no problem, but I do not use LV very often.
I´m a little bit unsure due to the price ranges for the Pentax bayonets. At the Nikon side the prices are more or less all the same from Chinese sellers but with Pentax there is a price range from more than 100 % as said in my first post.
Ok, I will see when the first sample will arrive.
Thanks again.
_________________ Rolf |
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Spotmatic
Joined: 18 Aug 2008 Posts: 4045 Location: Netherlands
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Posted: Tue Jan 11, 2011 9:06 am Post subject: |
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Spotmatic wrote:
Rolf wrote: |
But I must say that in the past I have had focus problems with the original Lxxxxx bayonets too. Sometimes front focus, sometimes back focus when the focus indicator lamp is on.
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What Leitax mounts are these? Naturally, a Pentax K bayonet does nothing with the focusing distances. If the camera thinks that the picture is sharp it will indicate so. A focusing error is caused by the body, not the Leitax adapter. _________________ Peter - Moderator
Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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Rolf
Joined: 02 May 2009 Posts: 4123 Location: NRW/Germany
Expire: 2015-12-26
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Posted: Tue Jan 11, 2011 10:48 am Post subject: |
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Rolf wrote:
Spotmatic wrote: |
Rolf wrote: |
But I must say that in the past I have had focus problems with the original Lxxxxx bayonets too. Sometimes front focus, sometimes back focus when the focus indicator lamp is on.
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What Leitax mounts are these? Naturally, a Pentax K bayonet does nothing with the focusing distances. If the camera thinks that the picture is sharp it will indicate so. A focusing error is caused by the body, not the Leitax adapter. |
Thanks Peter for your input. I will think about this. But one question. At the moment I think it is the same problem with AF lenses. Focus seems to be ok but the image is unsharp. Normally a problem of the lens or both parts -lens and body. A problem where Canon user can tell a lot.
i have had a strong back focus with a Chinese adapter, changing the bayonet to a Leitax I had a front focus. The differences in the register distance between Leica and Nikon/Pentax will be handle by the bayonet/adapter.
If there is something wrong you will have problems with infinity and - thats my thinking at the moment - unsharp images even the focus lamp in the cam is on. But it could be that I am wrong with my view of point.
_________________ Rolf |
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SVP
Joined: 15 Jan 2009 Posts: 665 Location: Greece
Expire: 2017-12-17
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Posted: Tue Jan 11, 2011 11:13 am Post subject: |
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SVP wrote:
I think Peter is right. I can't see how plain mechanical (i.e. unchipped) adapters / mounts can be blamed for focus confirmation inaccuracies, it's all about the good or bad performance of the focus confirmation system inside the camera body. |
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poilu
Joined: 26 Aug 2007 Posts: 10472 Location: Greece
Expire: 2019-08-29
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Posted: Tue Jan 11, 2011 11:19 am Post subject: |
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poilu wrote:
Rolf wrote: |
If there is something wrong you will have problems with infinity and - thats my thinking at the moment - unsharp images even the focus lamp in the cam is on. But it could be that I am wrong with my view of point |
AF adapter and bodies can calibrate the AF to make the focus led more precise
if the adapter is too fat you cannot reach infinite but it have nothing to do with precision of the AF led (except at infinite) _________________ T* |
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Spotmatic
Joined: 18 Aug 2008 Posts: 4045 Location: Netherlands
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Posted: Tue Jan 11, 2011 11:41 am Post subject: |
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Spotmatic wrote:
Rolf (and others of course),
First: it does not matter if there is a flanged adapter or not. Infinity focusing issues are only an issue at infinity, not at closer focusing distances. The AF subsystem still uses a part of the image to determine if a picture is sharp or not (phase detect AF).
If there's a discrepancy between the phase detect AF and what you see in the viewfinder then there's an interesting thing to think about. With chipped adapters I have the idea that the camera thinks that there's a certain AF lens on the camera (even if it's a manual lens). Now there could occur an interesting phenomenon. It's known that AF systems issue minimal focusing adjustments based on the characteristics of certain lenses. Have you ever thought about the fact that the wide open focus plane is not the focus plane anymore when a lens is stopped down? This is called focus shift (see here for an explanation: http://diglloyd.com/articles/Focus/FocusShift.html). The lens may be focused right when it's wide open, but stopped down the focus plane is somewhere else). What if the camera thinks there's an EF 50/1.2 lens on the camera which requires AF adjustment after being stopped down? This makes focusing certainly a very complex procedure.
Another problem is when there's a difference between the flange - AF sensor and flange - ground glass screen distances. But let's just assume the camera is calibrated well.
(IMHO Live View focusing is the best for us MF shooters, because focusing can be done when the lens is stopped down. And in this case what you see is what you get...) _________________ Peter - Moderator
Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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BRunner
Joined: 29 Jul 2009 Posts: 705 Location: Czech Republic
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Posted: Tue Jan 11, 2011 12:13 pm Post subject: |
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BRunner wrote:
Another issue can be, that different lenses have different longitudinal aberrations at different wavelengths and phase shift sensors can react to them in different ways. It's the same issue like, front/back focus AF problems with some type of artificial lights. _________________ .: APO-Maniac :. |
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Rolf
Joined: 02 May 2009 Posts: 4123 Location: NRW/Germany
Expire: 2015-12-26
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Posted: Tue Jan 11, 2011 6:15 pm Post subject: |
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Rolf wrote:
Few weeks ago I made the following test.
D700 & Leica 2/50 (wide open) & Leitax bayonet & tripod, focus manuell with cam focus indicator lamp, no chip = front focus approx 15-20 cm.
Changed the bayonet from Leitax to cheap Chinese, same test, nothing changed = back focus approx. 50 cm
Therefore I tought that the reason for this must be with manufacturing tolerances of the bayonet.
_________________ Rolf |
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Spotmatic
Joined: 18 Aug 2008 Posts: 4045 Location: Netherlands
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Posted: Tue Jan 11, 2011 7:29 pm Post subject: |
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Spotmatic wrote:
I'd say that your D700 is defective. What subject distances are we talking about? A backfocus op 50cm is a lot if your subject is at 1m _________________ Peter - Moderator
Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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Rolf
Joined: 02 May 2009 Posts: 4123 Location: NRW/Germany
Expire: 2015-12-26
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Posted: Tue Jan 11, 2011 9:02 pm Post subject: |
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Rolf wrote:
Spotmatic wrote: |
I'd say that your D700 is defective. What subject distances are we talking about? A backfocus op 50cm is a lot if your subject is at 1m |
distance was perhaps 3 meters, maybe 5 meters _________________ Rolf |
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koji
Joined: 21 Jul 2008 Posts: 2107 Location: Hiroshima, Japan
Expire: 2012-12-27
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Posted: Tue Jan 11, 2011 9:27 pm Post subject: |
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koji wrote:
Rolf wrote: |
Few weeks ago I made the following test.
D700 & Leica 2/50 (wide open) & Leitax bayonet & tripod, focus manuell with cam focus indicator lamp, no chip = front focus approx 15-20 cm.
Changed the bayonet from Leitax to cheap Chinese, same test, nothing changed = back focus approx. 50 cm
Therefore I tought that the reason for this must be with manufacturing tolerances of the bayonet.
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I tend to agree with Spotmatic's observation, since it is hard to understand
Rolf's distance discrepancies among mount replacements. I did my own
test with 0.5, 1, 1,5 and 3m distance, and my Summicron-R 50/2 with
a Leitax made mount is almost bung on, ie, lens' distance marker is
where I aimed +/- few centimeters. I normally does not relayed on Focus-
confirmation dot (nikon's case), but this time I used it too. I don't know what
went wrong exactly. I have two other Leica-R lens with cheap chinese mount
replacements, I did not notice front or back focus problem. _________________ Our Home Page has 18,200 photos in 575 directories today.
Lenses: https://www.pbase.com/kkawakami/top_level_my_lenses |
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