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Message: <blockquote data-quote="Somersetscott" data-source="post: 152862" data-attributes="member: 10691">I have the Sigma 170-500mm - It is soft at 500mm, this seems to be the comment on Sigma's 50,150,170-500mm range. So add a TC to this and I would expect the 700mm/top end mentioned is pretty poor. Feel free to prove wrong though <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> As mentioned there is an art at 500mm to get a steady shot, my 170-500mm doesn't have VR either making it very fun! Also I often lose my subject when birding - operator rather than equipment! but still 500mm is a long reach!</blockquote>