I couldn't decide whether to post this in latest acquisition or mirror lens club... but I figure you mirror guys will get more out of it.
I just purchased a Tokina 500mm f/8 mirror lens for the Contax/Yashica mount. For $40. It doesn't look like it's ever been used, the filters are still in the plastic and the cleaning cloth hasn't even been opened yet.
I removed the mount to modify it to fit on a pentax... but that's when I noticed that the k-mount ring from a cheap set of eBay extension tubes was a 100% perfect match for the C/Y mount that I removed. Once the C/Y mount was removed, the extension tube mount fit over the tokina lens with a very tight, almost interference fit. I was able to walk around and use the lens without any adhesive or screws, it was that tight.
I of course removed the mount (pried it off with a screwdriver) drilled some holes, and put in two screws to keep it in place, just in case.
$40 plus $10 for the extension tubes. Not bad at all!
Pics of the lens:
Here are the pics from the lens. Note that these are straight from the camera, with no post processing, no contrast adjustment, nothing except resizing or cropping:
100% crop:
100% crop:
100% crop:
100% crop:
100% crop:
Charles.