SharpShooter Loc: NorCal

Coach, just like today, they have red rings. But there are some old lenses worth adapting that are not L's. Such as the 55mm 1.2, a very special lens. If you are looking for old lenses, KEH has lots of them, just search for FD lenses.
If you already have some lenses, try one of the inexpensive glassed converters as Mogal has suggested. That will give you an inexpensive way to see if you can even get used to the old manual stuff with no ground glass/split screen. That can be a challenge. Theyre best used for stationary shoots, such as macro, studio or landscape. They are hard to focus, especially if you're stopped down at all.
They are great fun though. I've got the 600mm on an EdMika, works great.
Good luck. SS

olcoach Loc: Oregon

Thanks all. I have the adapter from B&H and I'm amazed how sharp the primes are. The Zooms not so much so I guess all the stories I've heard from the old days are true that the Zooms weren't as good as today's. I have a Canon 500mm that I have yet to try but as soon as I feel like some heavy lifting I'm going to hook it up. Thanks again for all your help and advice. Have fun and keep shootin' .Mike

SharpShooter Loc: NorCal

Coach, that's great. Let me know how that 500 works out. I will say, keep the exposure in control. If you overexpose some of that old, big glass, it can fringe, so I always try to expose a little to the left or dead on, but never to the right. Good luck. SS