I'm a big fan of Sigma lenses now, as I was Tamron a while ago. Yes, build quality isn't quite as robust as Camera manufacturers equivalent, but it's not too bad.
Would echo what has already been said about getting what you pay for. Sometimes though, that price difference is a little much to stomach. Sometimes in the case of specialist lenses the choice is already made.... looking at a v fast wide (the sigma 20mm 1.8) for example.
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primarily using Nikon film and digi kit, and some micro 4/3rds gear for experimenting with old lenses
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