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A top notch performer in every way, optically on par with the various 300 f2.8 offerings by the major camera manufacturers and well worth its high price on the used market. Excellent build quality, my only relatively minor gripes to withhold full marks are: the focus helicoid runs the other way from Canon FD lenses (kept me starting off in the wrong direction whenever I needed to focus fast); the lens comes with a neck/shoulder strap that IMHO doesn't really work well for carrying a 4 lbs weight and mostly got in my way when using a tripod; and although the tripod mount has two thread holes (good to help really lock down the lens and to prevent sideways wobble) in practice both holes are just a little too close together to work well with QR plates that can accommodate two mounting screws.