Originally posted by gastch Thankd for the Bigma to 300 comparison links. I head read the other ones but these other ones settle the debate for me. Their close but I think I'll go with the 300+Tc and crop if needed. Plus I can use the Tc on some other lenses!
I would say that it depends where you live. I used the 150-500 on the k5, the DA*300 was awful for focus on that body. Everything you use has limits, and the 150-500 needed lots of light. F8 or higher. The focus speed is nice as well as the OS in lens. I found that I couldn't use it outside of the four months of bright summer. I like shooting small birds in the bushes and it is too slow. For birds in flight in the open it is great.
The DA*300 is very sharp and close focus, but you will yearn for something longer. The TC works pretty good. I'd wait to see the reviews on the new long zoom. If you time it right for a few hundred dollars more you might be able to get one.