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Message: <blockquote data-quote="GYRob" data-source="post: 3501881" data-attributes="member: 38948">Its very rare I shoot above ISO 800 with any camera and I bought the 5DSr for the MPs and crop ability the 1dx MK II should have been 30mps  as the 5dmk4 is now.I would still go for the 5DSr as it in effect makes shorter lenses longer without a TC and of cause give's a faster shutter speed to play with although I do find you need a 1 stop faster shutter like with the 7dmkII this just give's an overall edge to getting sharpness as compared to say 20MPs .The file size is a pain sometimes but if you crop then do the PP work its not so bad .For fast action I would always go for the mkII birds fighting ,take off or landing the FPS and fast reaction just really helps get the shot but for perched or slower flyers, birds walking towards you then the 5DSr is well able to cope after all even the mighty 1DXMKII does not guarantee you WILL get the shot .All just my opinion .Rob.</blockquote>