Recent content by LesCM19

The plot thickens... The ring containing the bevelled channel unscrews and the thread there seems like it might be an M42x0.75 (T-Mount, I think, then) because the Praktica M42 lens cap doesn't quite fit.

I have a Vivitar 500mm mirror lens that I put an M42 adapter on to use it on Praktica MTL3 & MTL5 bodies :thumbs: many years ago when I used to dev & print. At the back of the lens body is a ring/lip with a bevelled channel around the circumference which 3 grubscrews of the adapter fit into...