Here is a lens from Sigma that fits into the medium to long telephoto range and is a step up from the average 70-300mm models. It sports a constant aperture of f/4 and Sigma’s HSM autofocus motor. We ...
Sigma's 120-300mm F2.8 DG OS HSM is the lens to get if a 70-200mm f/2.8 just isn't long enough, but you'll need a strong back to lug it.
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