Originally posted by peggers I'm also wondering if a Canon to Pentax converter exists? If so it may open up other lens options to us Pentax folk
Haven't seen one. There are multiple problems.
1. The flange distance for medium format is much greater than any Canon. So lenses wouldn't focus anywhere near infinity. This could be fixed with optics in the adapter.
2. Very few Canon lenses would cover the larger medium format sensor. Even if they did, edge quality would probably suffer.
3. Canon af lenses don't have a way to mechanically control aperture. The adapter would need electronics in it.
Even with all these negatives an adapter could be useful for macro. I would love an adapter to put Pentax PK lens on 645.
Thanks,
barondla