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Message: <blockquote data-quote="Claymore" data-source="post: 1494800" data-attributes="member: 64683">i have a Sigmonster lens (300-800mm) I had the 500mm Canon L but decided i prefered having a zoom as i have mobility problems so sold the Canon. Having used both I honestly cannot spot ANY difference in picture quality apart from the Sigma enables me to get closer.my mate is a pro togger and has used both my lenses and actually preferred the Sigma.The thing i have noticed over the years regarding quality is usually down to the person taking the shot ie My shots are far from excellent and this is down to me being a crap photographer but give the same gear to someone with more experiance and its amazing the difference in quality. So my £6500 Sigma lens isn't as good as a Canon 500mm? wish i'd know before buying it.Think I'll dig my old yashica fxd quartz out (remember them)? ah those were the days just stick a film in and away you go LoL</blockquote>