Well the new OS version of the Sigma 120-300mm F2.8 lens has been out now for close to two years, however there are still only a small handful of reviews out there on the web, and I only know of one A.net photographer using this lens, who seems to be getting decent results with his copy. I have even seen comments such as the lens being a 'Nikon 200-400mm F4 killer'.
I was just wondering if any one else had ever considered this lens and what is it that is holding people back from purchasing one. I myself have just sold my Canon 100-400mm in order to fund the purchase of the new lens. At $3100 and £2000, it's not a cheap lens however it is within the extreme ends of affordability in my opinion, especially when compared to the price of 300mm F2.8 primes on the market.
It appears to have a segment of the market to its self, the closet 'zoom' competitors seemingly being the Nikon 200-400mm F4 and the Canon 100-400mm. Whilst the new Sigma 120-300mm F2.8 OS weighs in at close to 3kg, the ability to shoot at 300mm F2.8 sounds fantastic. Likewise the specs boast an OS that gives up to 4 stops of stabilisation compared to the 2 stops of the IS of the Canon 100-400mm. offers
The lens can also accept both 1.4x and 2x extenders (without losing autofocus) to bring the max range up to 420mm and 600mm respectively. Whilst a 2x extender would be pushing it, I'd expect it to handle a 1.4x extender with ease and at least produce the same, if not better quality than the Canon 100-400mm at the longer end.
Any thoughts or opinions on this beast of a lens? For me, this lens seems like a good choice, especially with the rubbish light we get in the UK for the maority of the year.