Originally posted by TiminyCricket Well, for me the choice was easy. I wanted an ultra wide perspective, but did not want a fish-eye. So, I got the Sigma 8-16mm, as the widest non-fisheye lens currently available. The way I see it, if you're going to spend a ton of money on a wide-angle it should be the widest one available. The reviews I'd read of the lens were favorable-enough, so that sealed the decision for me. You have to be careful when there are people on either edge of the frame, as it will stretch them out, but this is a natural, physical property of having such a wide field of view and with practice and care it should not post a problem whilst still allowing for one heck of a wide field of view.
I kind of agree with you, but I looked for an used lens and found the Sigma 10-20 mm as well as the Tamron 10-24 mm and ended up buying the Tamron.
- Reading several reviews on both lenses I noted the Sigma was maybe best full open, but stopped down only slightly the Tamron took the overall lead (soft corners, but better center sharpness, lowest distortion and good flare resistance). On top of all, a little overlap in wide range can be very handy.
Quote: Comparison to other wideangle zooms we've tested recently suggests the Sigma's class-leading days may be numbered. On APS-C, it simply can't match the biting central sharpness of the Tamron in the 10-18mm range (for which, we suspect, users will mainly be buying this type of lens), and has more problematic distortion characteristics. However in a typical case of swings and roundabouts, the Sigma shows superior sharpness when shot wide open, and is better in the corners of the frame at all settings; it also has lower chromatic aberration, is better built and uses a superior focusing system.
Pro Sigma
Equal widest angle in its class
Very low chromatic aberration
Fast and silent HSM autofocus
Good build quality
Con Sigma
Rather inconsistent sharpness (partially due to curvature of field)
Pronounced, complex distortion at 10mm
Pro Tamron
Equal widest angle in its class, and largest zoom range (by a whisker)
Low distortion
Generally good resistance to flare
Con Tamron
Soft wide open (low local contrast)
Soft corners at all focal lengths and apertures
Wide diameter lens hood takes up lots of space in a bag
Either way, having an UWA zoom is fun (a kind of "must have" after kit lenses, besides fast portrait prime/zoom and/or macro) and if you don't buy two then the one you bought will be the best!!!