Well I have completed some extensive lens testing with my Canon D60 and am narrowing my lens selection down a bit. All of these lenses are in decent shape and are quite usable. No lens caps unless pictured. In a lot of cases, my choice was to keep a good T-mount lens over an equally good M42 mount lens. In a few cases, I ended up with two identical lenses, and some just weren't as good as the others in my collection. These are all M42 Pentax/Universal screw mount lenses. Adapters can be purchased for $10-$15 that will make them work with Canon FD, Canon AF (EOS), Yashica, Contax, Pentax K, Minolta, etc. Nikon adapters are available, but need a relay lens to reach infinity focus and cost around $100. These are easily adaptable to most CCD cameras and are perfect for use with starlight express cameras.
This lens is a Rikenon f/1.8 55mm. Some internal dust, but glass is in good condition. Filter ring has a small dent. No optical effect, but don't plan on using filters with this one. Everything works and it takes good pictures. Really sharp at the center, but off axis performance isn't quite as good as my Helios 58mm. Very good achromatic performance(see image). Asking $20 shipped.
1/4" CCD 6.6*
1/3" CCD 9.1*
1/2" CCD 13.2*
1" CCD 26.5*
I prefer Paypal or postal money orders. I have several lenses listed so check them all out.
P.S. The red fringes on the right side are from dark current in the D60.