I did some horse trading with some old equipment I never used and wound up with an off brand 300mm OM lens to play with. I bought one of those cheap adaptors on e-bay and took a couple of test shots today. Since it was a 300mm it is a 600mm equivalent on the 510. The meter was dead on and the IS worked flawlessly. I have a 50mm on the way and should be shooting test shots once I get it. But see. It can be done with some rather nice results. Now that I know how well it works. I may swing for a better quality OM lens to use. Considering this was 600mm hand held, I am impressed. Now to Plainville Ga and look for some Buffalo. There are some on a farm there that I could never get close enough to before.LOL