So I purchased one of the new Sigma 18-300mm F3.5-6.3 DC MACRO OS HSM Contemporary lenses for my Canon T1i and the USB dock to make adjustments/updates. There is some definite back focusing at middle ...
We first heard about Sigma’s innovative USB Dock last year at Photokina, and we’ve been curious about how the accessory will work ever since. This $60 gadget lets you connect your lens to your ...
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