I am looking for circular polarizer for hasselblad B50 and Series viii(50mm C T* lens).
Also, looking for extension tubes like 8 ,21,55 .
Let me know if anyone interested to sell.
Perhaps you've already considered this, but I like to use a B50 to 52mm adapter. I haven't noticed any vignetting; but if a concern, there's also B50 to 55mm.
If the lens is complete, the front ring should unscrew.
The Series Vlll drops in place and the ring screwed back in.
I don't know how a rotating filter would work in a Series fitting unless there are some made with a Series thread. There are Series to mm step up rings available so you can go to a standard filter size.
A Series Vlll actual diameter is 63mm. Series Vlll to 67mm/72/77mm step up ring will all work.
With B50, the front ring will rotate allowing the adjustment.
I'm not sure if you're still looking for extension tubes.
I have a set of 5 - 8, 10, 16, 32, 56.
Each have engraving on them from the previous owner, other than that they're in good condition.
PM me if interested.