This is a strange lens I got, that won't focus to infinity. It has a removable M42 mount with a "P" marking. I assume that means it's for Pentax M42 not something other mount with threads of the same size. <a href="http://www.23hq.com/punkman/photo/7633635"> "567" width="756" /> </a> It won't focus to infinity on my M42 to m4/3 adapter, which I've used with various M42 lenses and they all focus past infinity. I removed the M42 mount from the lens, it was held in place with 3 small screws. That shaved off a few mm. I held it with my hand up to the M42 to M4/3 adapter and it still didn't reach infinity. A picture taken with this lens. <a href="http://www.23hq.com/punkman/photo/7633634"> "567" width="756" /> </a> Ideas?