I got the Fotodiox M42 adapter so I could use this fast vintage lens. Alas, it took the brunt of dropping the camera and the front of the housing is loose, so I have to hold it together when shooting. You can see the range of movement in the shot with my fingers. The retainer doesn't come come completely off, but the front element can move. Makes it hard to focus. I'll shoot some images when I get some good weather, and some macros with a home-made M42 extension tube. The images here were shot with that tube and a Vivitar f2.8/35mm.