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@ewanmac
Does anyone have experience with the sigma 70-200 f2.8 OS lens? http://m.dpreview.com/lensreviews/sigma_70-200_2p8_os_c16 . I'm on the verge of buying one to be used with a d7000. I'll also be buying either the Nikon or sigma 1.4x teleconverter. My only worry is the weather sealing. Most of its use will be wildlife in dark and humid/wet tropical rainforest (borneo & Cmbodia) . Does anyone have any thoughts/ experience? I can't afford the modern Nikon equivalent and although I could borrow a Nion 80-200 2.8, its about 10years old, a little fungussy and the focus is slow and noisy.t