I'm looking at the sigma 105mm ex non dg or the tamron 90mm sp. I'll be using it on a canon 40d and just don't know which would be best. With the sigma being a non dg will it work ok on the 40d? Please let me know. Thanks
Can some please offer advice. I've seen some sigma stuff needs their chip updating to work. So is the 105mm likely to need the same? If so is the tamron a newer lens and better to go for?
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