Reviews and Problems with Sigma APO 800mm F5.6 EX DG /HSM
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22 April 2010
Excerpt: You may be thinking that the Sigma 800mm f/5.6 EX DG HSM weighs a ton but at less than 5kg, it's actually quite reasonable. That may still sound ridiculous, but this lens is not designed to be handheld. It's not only the weight but the focal length that makes this lens cumbersome.