We generally try to stay away from dribbling over new gear, but this is an interesting new lens from Sigma."The APO 200-500mm F2.8 EX DG is the world’s first Ultra-Telephoto Zoom Lens that offers a fast aperture of F2.8 at 500mm focal length. It .. maintains its fast F2.8 aperture over the entire zoom range.
Shooting distance and focal length can be viewed on the lens' LCD panel." If they show the current depth of field on the LCD panel, that would be very, very useful, but they don't mention that in their press release.
Filters are rear mounted, and a circular polarizing filter can be used. It comes with a dedicated 2x teleconverter. No price or launch date is set, and the weight is unknown but apparently Sigma were using two people to carry it around at PMA. Rumours that it comes with a free wheelbarrow are unfounded, but it certainly doesn't look light. It doesn't look like it'll be cheap either.
F/2.8 in a lens of this length is unusual, I think it's the world's first. Edit: Thanks Albert (comment below) for clearing up the DG classification - this lens works fine on full-frame 35mm sensors (and film!)
No-one has reviewed it yet, that I can see.
