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on Aug 25, 2019 18:58:44 GMT
Posted: Aug 25, 2019 18:58:44 GMT
After reading/posting in the Tamron Classics thread, I'm not sure why it didn't pop into my head until now... but... I don't ever recall seeing any Yashica C/Y lens, of any flavor, with any kind of 'MM' mechanism attached to or molded-in, at all. I'm aware you can trick any Contax MM body into using any C/Y lens no matter who made it, but I take it that this was an intentional decision not to enable Yashica lenses with the feature.
Is there some odd-ball ML, DSB, YUS model or version that has the tab?
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on Aug 26, 2019 8:10:12 GMT
Posted: Aug 26, 2019 8:10:12 GMT
They always told us, that the aperture blades of NON-MM-lenses would not react as fast as neccessary and not as fast as the blades in ZEISS-MM-lenses.
I am nearly sure that you can ifnore this (at least if you are using modern negative film).
On the other hand, the FX-103 already had a P-automatic without taking care of the aperture blades ... and without having the MM-pin.
I think, it's all about marketing ...
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on Aug 26, 2019 21:05:00 GMT
Posted: Aug 26, 2019 21:05:00 GMT
They always told us, that the aperture blades of NON-MM-lenses would not react as fast as neccessary and not as fast as the blades in ZEISS-MM-lenses. I don't think speed is the issue as non MM lenses still need to be able to stop down to the selected aperture in the same amount of time - before the shutter opens. It's more about controlling the aperture using the stop down mechanism which, originally, just needed to go from fully open to fully closed but, with MM lenses, it needs to move a specific amount to obtain the correct aperture. I've never looked at the physical differences but assume the non-MM lenses don't have precise enough control. |
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on Aug 26, 2019 21:10:16 GMT
Posted: Aug 26, 2019 21:10:16 GMT
I'm aware you can trick any Contax MM body into using any C/Y lens no matter who made it, No tricks required. Any MM body is capable of using non-MM lenses - but only in manual or aperture priority modes. Unless you mean trick them into using program modes in which case, yes, you can manually move the switch I guess but whether you would get the correct aperture or not might be the issue. |
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on Aug 26, 2019 21:13:41 GMT
Posted: Aug 26, 2019 21:13:41 GMT
After reading/posting in the Tamron Classics thread, I'm not sure why it didn't pop into my head until now... but... I don't ever recall seeing any Yashica C/Y lens, of any flavor, with any kind of 'MM' mechanism attached to or molded-in, at all. I'm aware you can trick any Contax MM body into using any C/Y lens no matter who made it, but I take it that this was an intentional decision not to enable Yashica lenses with the feature. Is there some odd-ball ML, DSB, YUS model or version that has the tab? Yashica never attempted to produce MM-coupled lenses.
I suspect their reasoning was that the cost of retooling for the relatively small number of post-159MM Contax users that would buy such adapted ML or YUS lenses was not economic. And of course, they never sought to manufacture any cameras with a MM-coupling. I think it was simply a matter of economics.
Interesting though that manufacturers like Tamron and Sigma did expect to see some benefit in providing the MM tab on a number of their C/Y lenses.
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on Aug 26, 2019 23:56:23 GMT
Last Edit: Aug 26, 2019 23:56:56 GMT by lumiworx
matthiasausk & @peterr ... I was thinking in terms of using Yashica lenses on Contax bodies, as opposed to matching the same 'auto' functionality with just Yashica body/lens pairs. As an example, using an RX body versus an FX-103, and putting an ML lens on it, with a DIY stopper to hold the MM-slider in the 'on' position. The RX gives me focus confirmation, that the FX-103 doesn't have - plus - the higher shutter speeds, and built-in winder, among other things. There are times that I don't need to go fully manual, and wouldn't mind using programmed modes - IF - the combo will work. I have my doubts that the ML series is less responsive in aperture opening than Zeiss T* models at up to 1/2000 sec., but it might be different at 1/6000 or 1/8000 shutter speeds. Something tells me it will take a roll of Tri-X on a field trip to find out.
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on Aug 30, 2019 14:54:27 GMT
Posted: Aug 30, 2019 14:54:27 GMT
Shutter speed should not be the problem: Aperture must be closed before opening of the first curtain. This is independent from the shutter speed, because the time is controlled by release of the second curtain. ZEISS argued, that the blades of the "older" ZEISS lenses were too heavyweight, so that they might not be closed. The blades of the MM lenses are -according to ZEISS- made of a different material, so that closed aperture can be guaranteed. I could not follow this argumentation even at that time, because blades have to be closed in A-mode as well as in P-mode. Besides my opinion, in fact the blades seem to be different from AE to MM, as it is described here: www.apotelyt.com/photo-lens/zeiss-contax-catalog |
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on Sept 25, 2019 20:04:31 GMT
Posted: Sept 25, 2019 20:04:31 GMT
After reading/posting in the Tamron Classics thread, I'm not sure why it didn't pop into my head until now... but... I don't ever recall seeing any Yashica C/Y lens, of any flavor, with any kind of 'MM' mechanism attached to or molded-in, at all. I'm aware you can trick any Contax MM body into using any C/Y lens no matter who made it, but I take it that this was an intentional decision not to enable Yashica lenses with the feature. Is there some odd-ball ML, DSB, YUS model or version that has the tab? Yashica never attempted to produce MM-coupled lenses.
I suspect their reasoning was that the cost of retooling for the relatively small number of post-159MM Contax users that would buy such adapted ML or YUS lenses was not economic. And of course, they never sought to manufacture any cameras with a MM-coupling. I think it was simply a matter of economics.
Interesting though that manufacturers like Tamron and Sigma did expect to see some benefit in providing the MM tab on a number of their C/Y lenses.
It’s not that easy to come by an Adaptall 2 mount with the MM tab - Certainly it took me a couple of years to get one for 24-48 & 80-200/2.8 Tamron SPs and am still looking for a second. |
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on Sept 26, 2019 15:42:27 GMT
Posted: Sept 26, 2019 15:42:27 GMT
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on Sept 26, 2019 16:53:07 GMT
Last Edit: Sept 26, 2019 16:53:44 GMT by lumiworx
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