--- John Robison <omrobison@xxxxxxxxx> wrote:
>
> The lens flange distance on the OM is more than
> the
> Pentax by about 1/2mm so unless you could remove
> part
> of the original mount, and make a custom adapter,
> you
> could not focus back to inf. with even a very thin
> adapter. I assume you are talking about Pentax's
> 300mm
> f4 optic, not an early 300mm f6.3 preset lens.
>
> __________________________________________________
You should be able to gain a 1/2 mm by changing the
stops on the focusing helicoid. So if the proper
adapter were avaiable, ie. screw to OM mount, it could
probably focus to infinity with those sharpness
reducing negative diopter lens.
=====
Warren Xato
For where to go when you know when
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