Why is a Pentacon 6 adapter not compatible with this Biometar 120mm?

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leakylightbucket New Member • Posts: 2
Why is a Pentacon 6 adapter not compatible with this Biometar 120mm?

I have loved shooting with the CZJ Biometar 80mm f2.8 using a P6 -> m42 and m42->FX adapters on my Fuji. Decided to puchrase the 120mm as well, especially seeing some reviews and the fact that it is also a P6 lens. It's a used Biometar purchased over eBay, however, upon getting the lens I realized the mount on the back of it is a little different and does not fit the p6->m42 adapter. For comparison here are photos of the back element on both lenses. The first one is 80mm and the second is 120mm.

As you can visibly tell, both the mounts are different. I do not want to return the 120mm as the glass elements do look clean and it is hard to find a good glass at a good price. But what mount is it?

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