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Message: <blockquote data-quote="mikfoz" data-source="post: 1441712" data-attributes="member: 72221">I'm not sure that's true - it depends what you read. The 150-500 is a newer lens and I've heard pretty good things about it next to the bigma for quality. The point I'm making here is that Sigma seem to get bashed by pro-lens snobs on a regular basis when they produce cracking lenses. While I can't wave around a 150-500 I can throw in a shot from the bigma. It produces good shots at f6.7 as well but I stopped down that day because I could, and it was bright. Check my gallery out for others in lower light, wide open and still sharp.The only reason I got a bigma was because I wanted the wider range for motorsports. if I were just birding I'd have got the 150-500. Surely one of the reasons the bigma is more expensive is that it has this wider zoom range which takes a lot more glass and engineering.</blockquote>