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N-mount to M42-mount conversion

 
Post new topic   Reply to topic    conurus Forum Index -> Contax N to Canon EF Mount Conversion
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snoopy5



Joined: 27 Jul 2008
Posts: 1

PostPosted: Sun Jul 27, 2008 2:33 pm    Post subject: N-mount to M42-mount conversion Reply with quote

Hi

I am thinking about buying a used Zeiss N70-200. But I would much more prefer an M42-mount on it instead of a Canon-mount conversion.

With an M42 mount, I could use it on Canon, Pentax, Sony, Sigma, Olympus... so a lot more flexibility...

I know that I then do not have AF anymore and only stop-down metering. But I am fine with this restriction. I am doing the same now with Zeiss ZS lenses Wink

Would this be possible and if yes how much would this cost?

Thanks in advance
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conurus
Site Admin


Joined: 15 Aug 2006
Posts: 795
Location: Vancouver, Canada

PostPosted: Sun Jul 27, 2008 5:12 pm    Post subject: Reply with quote

Unfortunately, the aperture diaphragm of a N mount lens is electronically controlled by the camera. While there is apparently an aperture ring on the lens, it was not mechanically coupled to the aperture diaphragm. Rather, it is "fly by wire", and requires power to do its trick. Without power and the appropriate commands to the lens, the lens will not stop down at all.
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I am a bird and I uncovered the E, EF and N-mount communication protocols!
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JohnLuoHD



Joined: 01 Aug 2008
Posts: 5

PostPosted: Fri Aug 01, 2008 7:35 am    Post subject: M42 AF Reply with quote

can , but difficult work indeed. only pentax and olympus 4/3 AF motor (like USM) protocol just recently announced.

in fact, best body still in canon mount.
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