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Message: <blockquote data-quote="Clovishound" data-source="post: 839364" data-attributes="member: 50197">What's a half a stop among friends?I've never used, or even held the Tamron. I got the 200-500 because, at the time, there was no affordable long tele for the Z bodies. The 200-500 was considered to be an excellent performer for the money, and was reputed to work well using an FTZ. I've been very pleased with it's sharpness. I am looking to upgrade to a native Z mount lens in the future, and the 600 F6.3 has the advantage of being about a pound lighter, and somewhat shorter than the 200-500 fully extended. I'm not getting any younger and shorter and lighter is sounding better and better.</blockquote>