Digital photography

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

Gonna give you 105-300mm on DX, which might be fine if you want it for wildlife etc, but is on the long side for a 'normal' tele. I have the 50-150 2.8 (v1, 5-6 years old, non-OS). It's one of my favourite lenses: razor sharp wide open, smooth bokeh, lightweight for its range and speed, fast, accurate HSM focus. It's not weather-sealed (no rubber gasket around the mount, anyway) so I couldn't say how it would hold up in a downpour or tropics, but it's been out in the rain a number of times with no problem. They now to an OS version which is considerably bigger, heavier and more expensive, but you might be able to find a used one cheapish on eBay. Highly recommend if weight is a consideration.