what brand of camera are you using? I'm only asking as the Sigma 150-500 retails for ~£700 which if you're a Canon user would but you in the region of a used 100-400 IS or 400 f5.6 both of which will out perform the Sigma or the Tamron. Sure you won't have as much reach but a good quality 400mm will be better than a lesser 500mm.
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