When people ask for recommendations on a super-wide-angle lens, they're often trying to decide between the Tokina 11-16 f/2.8 and the Sigma 10-20mm f/3.5. I tested these two lenses side by side last year and decided on the Sigma 10-20mm for several reasons: 1. Extra range 2.

I bought this lens specifically over the Sigma 8-16 because I needed it to accept 80A filters and have a constant f3.5 aperture because I do a lot of both low light handheld and tripod night shooting.

constant f3.5; accepts filters

though the center is sharp at all focal lengths and apertures it is almost useless at 10-12mm due to poor edge sharpness and very high lateral color starting about 30% out from the center

This is an excellent lens for the money. At 10mm (F3.5( it was slightly soft but after 11mm the images were very sharp (F.4 and up). The quality and feel of this lens is really nice. It is a nice fit and nice price for my 7D.

Light lens compared to my 16-35mm; nice color and decent low light performance; nice build quality

Little soft at 10mm but sharpens quickly above 11mm

Yes, I would recommend this to a friend

Consistent Output; Fast / accurate auto-focus; Strong Construction

Heavy

I bought it for using with Nikon D300S.. quality product with reasonable price..

Easily Interchangeable; Lightweight; Strong Construction

Poor in Low Light

Love the effects with short depth of field. Nice lens for landscapes. Not experienced enough photographer to quote on lens creep or vignetting but for an amateur like me, a lovely wide lens for my entry Nikon D3100, producing very good pics.

Consistent Output; Easily Interchangeable; Lightweight; Quick Focus; Strong Construction

BIG FAT YES! Good lens, Good value for money, Very nice quality pictures. Nothing to complain about. Who not happy just buy better, pay 700,1000,1500 pound and more for lenses. If money is a problem so just enjoy what you got. 100% RECOMEND this lens.

Great lens, compares very favorably to my Canon 17-40 that cost much more. The set 3.5 is great! There is very little distortion (bulging/curving) and good sharpness even at edges. As long as you keep the camera level, all verticals remain straight.

The Sigma 10-20mm is always with me on my family vacations. The 20mm is perfect to capture everythin

Sharp at all F-Stops Lightweight & versatile

Vignette and fish eye effects with lens at its widest

I was lacking a wide angle, Im no pro. I went with sigma as its cheaper than Canon and has a great reputation. I really like the fixed apature and the fact that it has a super warranty, hood and case. This very quickly became my "walking around lens" just because it is so versatile and fun to use.