Hello all, I've just invested in an Olympus PEN and really enjoying the camera so far. Part of the appeal in getting one was the ability to try out different types of adapted lens with the camera. I'm currently looking at the old M39 and M42 ones on ebay. In particular I've been looking at the Industar 50- comes in M39 or M42 mount. I've already ordered an M39 adaptor and Industar 60... So the question I'm asking really, if given the choice between M39 or M42, what is better on an m43 camera? Thanks in advance.