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Message: <blockquote data-quote="mikew_RIP" data-source="post: 486099" data-attributes="member: 14174">I have used both,i had the 50-500 on loan twice you have a difficult situation on your hands.The 50-500 is a good lens,i said somewhere its better than it deserves to be be with that zoom range,the tamron in my eyes is slightly better IQ wise and locks on focus better plus 100mm longer,although the 50mm on the sigma makes it a better walk round lens and it doesn't suffer the occasional focus freeze of the tamron.They both weigh about the same but i found the Sigma had better balance though that could easily be a personnel thing.I wouldnt like to be the one to push you in either direction</blockquote>