Originally posted by monochrome It is quite light, so the lack of a tripod mount is not an issue in any way at any extension... Hand holding the lens is a snap - can do it all day at any extension.
I'd certainly take issue with the need for a tripod mount. Depends on shutter speed, of course, but I've seen severe motion blur at 300mm and 1/15sec on even a slightly windy day. It was so bad I could see the motion in the viewfinder! This is with a Manfrotto 055XPROB, which is about as sturdy a tripod as you can get. And using an IR remote. The head is a ball type Giotto MH1002, which is probably the weak link in this picture, but it was locked down solid.
I even tried supporting/damping the end of the lens with a finger, and that helped. But heck, my finger isn't a very stable platform either.
Fact is, a 300mm sticks out a long way. I'm trying to figure out a way to make my own mount/support for the K20D with a long lens mounted -- the supports sure are expensive to buy!