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Message: <blockquote data-quote="rb_stern" data-source="post: 3355412" data-attributes="member: 1461">I have a D7100 and 300F4PF-VR with 1.4TC. If I'm very careful with hand-holding technique and try to expose to the right, I can get very sharp results and I can crop quite heavily and still get good feather detail. I also have an Oly OM-D EM-5 M4/3 and 100-300 (300-600) equivalent lens, that weighs about the same , and especially for flight shots, never has the same quality unless the birds is really close and I don't have to crop. Whenever I have tried to save weight by taking that gear with me when travelling, I have eventually regretted not having my Nikon, especially now i have this PF lens. (Before, I had the old 300 F4 then the Tamron 150-600, and this is less than half the size and weight). Here -https://photographylife.com/nikon-dx-vs-fx is an excellent article about the 2 types, and what "crop factor" really means on a Dx sensor. Although they come down on the side of Fx, I think that emphasizes landscapes etc. rather than birds. I'm very happy with my current setup.Richard</blockquote>