I bought an 86mm filter for my 300mm f5.6 Rodenstock Sironar-N lens but it only screws in about 1/2 of a turn then stops.
The lens threads are pristine, there are no dings, dents or bends. So what is going on?
Did Rodenstock use some sort of non-standard threading on the lens? If so how do I get filters, step rings, etc. to properly work?
Thanks.
Terry
Bookmarks