On Mon, 25 Oct 2004, Steve Jolly wrote: > > MC Mir-47 Pentax K 2.5/20 Lens > > I've got the MC Mir <snip> > Contrary to my findings, other people have reported the lens to be very > sharp - I *think* I've worked this one out: on many Pentax bodies > (certainly M series bodies, with their large, high-magnification > viewfinders) using the rear-element filters blocks the mirror, so I've > been using the lens without them. However, they are not plain glass - > they're slightly concave; I plan to extend the mount > out a little (losing true infinity focus, but that's not necessarily a > problem with 20mm-lens depths of field) and see if that helps.
Steve, Mine's sharp with the filter on (LX). Yes, it fouls the mirror on M's (took a tiny chip out my Program A (Program Plus) mirror :-( You can grind down the outer edge of the filter ring at a 45 degree angle to make it clear as they're quite thick pieces of ally. Chris
