Very helpful.

Quote Originally Posted by neuroanatomist View Post
the RF 100-500 at 500mm is nearly as good as the 100-300 + 2x.
I certainly use the 100-500 for birding with pretty good results and am very impressed w/ its sharpness. As JH pointed out the bokeh/subject separation is not the same a f4.....

I like the idea of the ultra wide - hmmm.... more fun to exercise my GAS self management skills.