Sigma 10-20mm F4-5.6 EX DC / HSM

price, usability, design, reliability, size

92% of the reviews on Amazon.com give this product a positive rating.

Equal widest angle in its class ; Very low chromatic aberration ; Fast and silent HSM autofocus ; Good build quality

Rather inconsistent sharpness (partially due to curvature of field) ; Pronounced, complex distortion at 10mm

The Sigma 10-20mm F4-5.6 EX DC HSM is, on paper at least, a very attractive option for APS-C users looking for an ultra-wideangle zoom. The standout selling points are undoubtedly that 10mm wideangle view and the HSM focusing motor, which when coupled...

' f/2.8 aperture is very nice.And the Sigma 10-20mm f/4-5.6 EX DC HSM Lens is another fine option from this review list - especially from a price standpoint.If you don't have an ultra-wide angle lens for your APS-C DSLR, definitely get one.

Attractive price ; Well built ; Great autofocus

Image quality can be disappointing

This would be an absolute bargain if it weren't for the lack of biting sharpness in the images it produces

very good image quality in the centre of the field ; good control of the chromatic aberration ; negligible astigmatism ; distortion controlled exceptionally well (the straight lines are not bent) ; efficient and silent autofocus ; good work against...

The Sigma AF 10-20mm f/4-5.6 EX DC HSM is a worthy alternative in the ultra-wide arena for APS-C DSLRs. At 10mm it showed some of the highest resolution figures that we've seen so far here whereas at 14mm and 20mm the results are slightly worse than...

The lens is remarkably free of objectionable distortions. In fact at 10mm distortion is only extreme and noticeable in the corners, if you look hard. Resolution and general sharpness are excellent. And the auto focus is a delight. Third party lenses...

There is little to criticise about the lens. Vignetting is apparent, but that is also par for the type. And it is easy enough to remove in Photoshop

Extreme wide angle lenses are a lot of fun because they provide a new perspective on the world. Even for portraits, where the rule of thumb is telephoto-is-better, the wide angle can integrate the subjects with their environment in a way that creates a...

Attractive price, Well built, Great autofocus

Image quality can be disappointing

This would be an absolute bargain if it weren't for the lack of biting sharpness in the images it produces

Lack of critical sharpness, poor control over chromatic aberrations

Good build quality

Some lack of critical sharpness, particularly in the corners, combined with poor control of chromatic aberration has let down what could be a great optic for the price.