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I can understand the need for a lighter set-up. I love the IQ from the 40-150, but that is generally not enough range for BIF, unless you have very large birds at close range. If I had to stick with Oly bodies, the MK III would probably be the one I would choose. Regarding lenses, I have heard mixed reviews on the 300/4. Some have shown great results, and others have called out focusing issues. I do not know if that is user error or QC issues, but before I spent that much on a lens, I would want to make sure it was not going to give me issues. I have not heard anything on the 150-400 so I cannot comment.I have been a longtime Nikon shooter but at 75, and having had both shoulders replaced, I'm finding the full-sized bodies (D500 & D850) a bit on the heavy side. I call myself a "nature photographer" and enjoy photographing wildlife in general and birds in particular. Thank oy for responding to my question
