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Message: <blockquote data-quote="J-see" data-source="post: 508190" data-attributes="member: 31330">With a TC1.4 you'll lose about 5-10% IQ but you'll also be able to down-sample certain shots which will improve their IQ compared to the cropped ones. They do indeed only work with a certain selection of lenses but can, very easily, be adapted to work with more. TC does also affect your shutter speed. The higher the increase, the higher your shutter speed needs to be, relative to normal shooting.For crop or DX on the D750: it doesn't make any difference but I personally will never shoot crop mode. I always maximise my data while collecting and do any IQ adjustment in post. I see crop mode only as an option if you need a faster/longer burst mode or have too little storage capacity.</blockquote>