imagemeister wrote:
Hi, yes, recently I got a decent image of a Kingfisher with 400 f4 and 1.4X on a 80D APSC. I have been on the fence about getting a 2X, but after thinking more about Kingfishers and Kestrels I have ordered a used Canon 2X III to put on the 400 DO. This will give 800mm f8 + the 1.6 crop factor = 1280mm full frame equivalent and still have AF on the 80D or 1D mark IV.
Don't falsely equate the performance of other brands with Canon EOS technology.