Quote Originally Posted by sanking

But what about a Pentacon 6 to Pentax 647 adaptor? Does such a thing exist? I ask because I have a lot of long focal length Zeiss optics (300mm Sonnar, 180mm Sonnar, etc.) and would like to use this on 6X7 format for a specific project.

Now that I don't know. Hopefully someone else around here does.