ebrunner wrote:
I have a Sigma 150-500. The advantage is that the 150-500 has image stabilization which makes is manageable to hand hold. Better, of course, with tripod; but you can hand hold that lens. Tamron also has IS; but, it seems, that lens is hard to get hold of.
The middle option between hand-holding and using a tripod is using a monopod. Combining a monopod with IS works very well!