Originally posted by moroccanimager
Yup, I have the 300mm which I've used a few times, particularly for dunes. Decent enough quality with a bit post work, even at f22. I picked one up from Japan for 100USD. The main issue is stability in slight winds. I've had to up the ISO to keep above 1/60 even with a tripod to avoid noticeable shake. Having said that, it's a mounted via the camera and not the lens which would no doubt help.
Many moons ago I did some tests to see which setup gives me more stability with the 300mm lens on a tripod.
From memory, I found that mounting the lens on the tripod gave more balance but much less vibration attenuation.
However, mounting the camera on the tripod introduced a tension which was just enough to dampen the vibrations from the shutter. Unfortunately this will not help with the heavier lenses like the 600mm, but the 300mm is still in the 'light' category.
Further stabilization was achieved with a bean bag on the lens. The location of the bean bag I found to be lens specific, because the bean bag adds mass that absorbs the vibrations from the camera traveling through the lens. I know this is an old trick used effectively by many.
For on the field use I mounted the camera on a gimbal and mono pod and cranked up the shutter speed, that works really well, especially wildlife. I found the same with the 300mm, 400mm (camera on tripod mount) and the 600mm lenses (lens mounted).
Earlier this year my second gimbal gave up the ghost and I went back to a fluid video head on a medium tripod. Seems to work much easier and as practical as the gimbal. The video head also uses a much bigger mounting plate, which helps dampening the vibrations from the camera. I also found vibrations to be much less if I don't use a ballhead, especially the ones with a thin leg ( not sure what the thingy is called that connects the base with the ball).
In tests I confirmed my intuition that hanging a weight from the tripod, does not do much to dampen vibrations, it may help to keep the rig being blown away in strong winds, but does very little to dampen shutter vibrations.
I suppose to solve shutter vibrations, it helps to start as close to the source as possible.
Sorry if I'm slightly of topic here...