Lately I’ve been experimenting with using older lenses on my Canon 10D. My father had a fairly extensive set of Pentax M42-mount and Rollei bayonet-mount lenses. They’re manual focus, like just about all equipment of that era, but the optics are excellent. And unlike the expensive modern equivalents they’re in my camera cabinet just waiting to be used.
Here’s a pic taken with one of the telephoto lenses:
But for some really great sample photos check out Yu-Lin Chan’s pbase gallery. He’s got an impressive collection of Pentax lenses which he’s also using on his 10D. The photos he’s taken are organized by lens and include comments on the optical characteristics which also makes them a great reference.
The Canon EOS mount is particularly well suited for this sort of experimentation, and adapters for a number of manual focus lenses are readily available. I have an adapter for M42 mount (aka Pentax or Universal screw mount) lenses that I purchased a few years ago via ebay for my Peleng fisheye. I don’t have an adapter for the Rollei QBM lenses yet, but (thanks to a helpful hint from Mr. Nick Roberts) I see they’re also available on ebay.
It’s nice to ressurect old equipment and make it useful again. And it’s a nice reminder that today’s digital cameras rely on optical principles established many decades ago.