I don't know what other adapters are out there, but can tell you
something about what could be out there. It all hinges on lens mounting
flange to film plane distance. OMs are 46mm and the EOS mounts are 44mm,
leaving enough distance between the back of a Zuiko and the front of an
EOS camera body to fit an adapter and retain infinity focus. Nik*n at
46.5mm and Cont*x/Yashic* at 45.5 don't have this possibility, so any
adapter has to have a negative lens at the back of the adapter to
achieve infinity focus wih Zuikos. I know nothing about Min*lta mounts,
but the AF mount is 44.5mm and MD is 43.5. For this reason of short
flange to film distance, the EOS is the most appropriate for adapting
other brand lenses.
The weak negative correction lenses in adapters act like weak
telextenders, slightly increasing the focal length and decreasing the
speed. In a test Herb Keppler did in Pop Photo, the effect on lens
performance was small, but noticeable in the tests, perhaps not in use.
There are adapters for other brand lenses to Nik*n (and possibly other
combos) that use a MC aspheric corrector element, which should further
minimize any performance limitations.
Not all adapters will necessarily work with all lenses. I know from
personal experience. I bought an adapter for M42/Pent*x to Nik*on which
doesn't work with the Carl Zeiss Jena Tessar 2.8/50 T I wanted to use.
The problem is tha the lens protrudes back far enough from its mounting
flange that it hits the back of the adapter before screwing all the way
in. It's not a fault with the adapter, as it has to hold a corrector
lens behind the main lens without interferring with the mirror, so it
can't go any deeper. Just the case that not all lenses can be adapted to
all cameras.
Moose
Per Ohstrom wrote:
Are there any other OM-to-something-else converters out there? I think
I saw a question about a N*k*n converter but no answer. Are there any
for P*nt*x, M*n*lt*, or C*nt*x?
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