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Message: <blockquote data-quote="captain birdseye" data-source="post: 479650" data-attributes="member: 21047">i have recently bought the sigma 150-600 c plus the usb dock.i have only taken it out a few times when the lighting has been harsh and subjects few and far between but i must say that the lens has good potential.it is sharper than i expected at 600mm even at f6.3.it is a bit of a beast to keep steady but that is all a part of the learning curve i suppose.it fits nicely into my lowepro flipside 300aw and is relatively lightweight.one thing you must take in to account is that 600mm is not a magic bullet for birders. ie, you still have to get as close as you can to get the best results.</blockquote>