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Message: <blockquote data-quote="RocketCowboy" data-source="post: 493838" data-attributes="member: 25095">Any FX lens that is 1.5X longer in focal length than the lens you have on your DX camera.I really don't mean to sound rude, but using something long like the Tamron 150-600mm lens on a D5200, when zoomed out to 600mm is giving you an effective focal length of 900mm. Do get the same effective FOV on a D750, you'll need a 900mm lens. The D750 will have better low light capabilities, so that could help improve the IQ and maybe allow you to shot a little wider and crop, but usually the preference for long lenses on DX bodies is all about the crop factor.</blockquote>