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[OM] Re: rokkor on EOS

Subject: [OM] Re: rokkor on EOS
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Thu, 30 Oct 2008 12:25:54 -0400
Thanks.

Chuck Norcutt

Sawyer, Edward wrote:
> 1) $3-400 might seem like a lot but indeed it's a lot cheaper than the
> Canon L (and basically as good) and inline with what the nice 50-ish
> f/1.2 lenses from other manufacturers are going for. (Oly, Pentax, et
> al)
> 
> 2) I think it uses the same optical formula as the Noct (minus the front
> aspherical). 
> 
> 3) Cogitech = Paul Yates, yes. I don't think he has done anything with
> the Oly 20-40 yet, it's got fungus and he hasn't cleaned it and is
> scared to send it to someone to clean, from what he has written
> elsewhere. 
> 
> 4) I can measure the spacer distance if you want to know, however it's
> slightly different for each lens/camera combo. They (the lenses) are
> individually collimated so infinity is in a slightly different place for
> each (adjustable of course) so a spacer dimension would just be a rough
> idea - it could be too thick or too thin, slightly. 
> 
> 5) Rokkor-EOS conversions - sometimes an M42 mount is used as a basis,
> if there's enough room to machine down the lens itself by the .5 - 1mm
> needed. I used an M42 mount and removed the flange, leaving just the EOS
> bayonet then machined out the inside of that, and nested the Minolta
> mount bayonet inside it for the 35/1.8 conversion. Usually the limiting
> factor is how far the rear element sticks out the back - too far, and it
> will hit the mirror on a fullframe EOS camera. Some lenses are a
> non-issue this way (usually teles for example).
> 
> -Ed
> 
> 
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