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Forum: Pentax Medium Format 06-01-2011, 01:40 AM  
Pentax Medium Format Resources: Pentax 645: Third party lenses via adapter
Posted By ARCASIA
Replies: 73
Views: 48,095
Very nice summary. I have been shooting with CZJ Pentacon 6 lenses on a Pentax 645 and 645NII cameras for a number of years now with very satisfying results. I should caution that it was quite difficult finding an adapter with parallel mounting surfaces, and went through several East European and Chinese samples before I found a good one. It is amazing how far off some of them were. Also, one must accept stop down operation.

If you really want to use Pentacon 6 lenses, I would suggest getting a Kiev 88 CM or Arax CM, which is actually a Kiev 88 CM that has been improved through various modifications. With the Arax CM, you can get a through the lens metered prism (spot and weighted), 6x6 size, rather than 6x4.5, and automatic aperture operation.

Another course of action is to adapt Pentacon 6 lenses to the Pentax 67 by rebuilding the mount end of the lens. I have adapted the Carl Zeiss Jena 120/2.8 Biometar, and the 180/2.8 & 300/4 Sonars to the 67 mount. All 3 lenses have large enough image circles for the 67 format. Like the 645, it is stop down metering, but the film size is 67, rather than 645, to me, well worth the effort. The adaptations are reversible for the 120/2.8 and the 300/4, meaning you can recover the P6 mounting if you wish, but with the 180/2.8, the alteration is irreversible, as structural parts of the original 180 lens must be altered.

Best, Alan
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