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Message: <blockquote data-quote="Love Nikon" data-source="post: 440110" data-attributes="member: 38179">I would have said its more than worth checking into ..having the back focus right is critical ...why would you want the real focus point to be say  4 inches in front of what you are shooting???With long lenses I put a lump of high grain wood on my block paved drive  at a normal shooting distance in your case use 600mm at max aperture and focus on the wood ...then check if the wood or the blocks are in focus..or you can put a 2ft rule alongside and read the markings on your computer at  50 or 100%....you must have this cock on.</blockquote>