One of the things that makes Yellowstone unique is the long sight lines. Its not uncommon to spot some of the larger mammals when they are several miles away so it's a bit frustrating no matter what glass you bring. Far is far and no lens can make a sharp image over those distances. I often revert to video in those cases as I find it is more forgiving of a loose crop and Canon's video crop ratios become an advantage.
As far as lens choices, it really depends on what you hope to photograph. Grizzly bears, wolves and moose generally require as much glass as you can muster although if you put the time in you can occasionally get pretty close to those with reasonable safety. Black bears, elk, deer, fox, coyote, sheep, etc you can often get quite close to and a 100-400 or 150-600 can yield some very nice frame filling shots. I'd probably recommend going with one of those and and 1.4x extender as that will provide the most flexibility. Yellowstone is huge and you are going to have to be on the move to see much of it in a few days.
As far as lens choices, it really depends on what you hope to photograph. Grizzly bears, wolves and moose generally require as much glass as you can muster although if you put the time in you can occasionally get pretty close to those with reasonable safety. Black bears, elk, deer, fox, coyote, sheep, etc you can often get quite close to and a 100-400 or 150-600 can yield some very nice frame filling shots. I'd probably recommend going with one of those and and 1.4x extender as that will provide the most flexibility. Yellowstone is huge and you are going to have to be on the move to see much of it in a few days.
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