I will be spending next summer up in Alaska and want to get some wildlife shooting in. I would like to start planning now for what lens to save up for.
I have been looking at the Sigma 150-500. It has gotten some pretty good reviews and the range is very impressive, especially when you consider that I will be shooting on a DX camera, that gives me a max zoom of the equivalent of 750mm. Which to me sounds perfect for shooting things like bears and such that you either don't want or just can't get close to.
I will have other lenses for anything closeup when the 150mm end is too long (though changing lenses is always a pain in the field).
That being said, it is a bit on the slow side. I also have never shot with close to anything that long, so I don't know if it is overkill or not.
I do want image stabilization, so that way I don't always have to hike with a tripod, and don't have to set a tripod up for every shot.
What is typically considered the usual focal range for wildlife photography? How important is having a fast lens (I doubt I will be doing a lot of night or lowlight shooting)? Any other recommendations within that general price range? Would something in the 70-300 range be a more practical choice (or maybe even one of the 28-300, though I hear you sacrifice some image quality in exchange for that flexibility)?