Sigma EX wide-angle zoom lens - 10 mm - 20 mm F/4.0-5.6

Sigma EX 10-20mm f4-f5.6 DC HSM

Advantages: Good quality results. Good build. Compact. Price.
Disadvantages: Distortion with architecture and interior shots.

; Boats, boulders, trees or whatever in the corners of the frame, where it can make things appear just a little 'odd'. Vignetting is the other problem area. Although expected with such a lens, it is somewhat worse than the Canon equivalent. Vignetting is very obvious at 10mm and f/4 and remains so even at 14mm and f/4.5. It does get a little better at 20mm and f/5.6 but by this time, the best fun is over. Certainly, the problem is helped by stopping down but only to an 'acceptable' level in my opinion. Resolution or sharpness is really quite good for the price point of this lens, almost equalling the Canon lens in many respects. Even at the widest 10mm end, centre performance is really VERY GOOD although the edges are a little behind at VERY GOOD- while the corners only achieve GOOD levels. Performance is improved by stopping down, when ...

davecham 27.12.2008 · Read full review
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Review of Sigma EX zoom lens - 10 mm - 20 mm

Sigma 10-20mm - pro quality at amateur price

Advantages: excellent image quality, sturdy build, great price
Disadvantages: relatively slow aperture, slight softness in mid-range of zoom.

The Sigma 10-20mm EX lens is a low-to-mid priced lens, aimed at the amateur/enthusiast market and available in the usual Canon and Nikon mounts. I own the Canon-fit, so all information contained in this review is in relation to that lens. For anyone interested in landscape photography, a wide-angle lens is a must-have piece of equipment. With standard kit lenses generally weighing in at the 18mm range at their widest zoom setting, you will be astonished at what the extra 10mm can provide you with. With this extra range of view, it's also an ideal lens for architectural photography and can make even small interiors appear almost cavernous at times. The lens itself is solidly-built, as you would expect given the pricetag and the Sigma EX badge - a mark of quality on Sigma's lens range - and the weight is satisfying. It may feel ...

jasonandreas 30.09.2008 · Read full review
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Review of Sigma EX zoom lens - 10 mm - 20 mm

Sigma AF 70-300mm f4-f5.6 APO DG Macro

Advantages: Decent quality on a budget but only for APS-C digital SLR's.
Disadvantages: Really quite poor when used with full-frame digital SLR's.

of good quality. I don't know if it is simply a variation between samples but my own APO version appeared to have somewhat 'smoother' zooming than my friend's non APO one. As usual for Sigma, a decent lens hood (barrel type) and a soft case are included in the package. The lens sports a 58mm filter thread, so filters are relatively inexpensive to purchase. Being of more 'ordinary' status in the Sigma hierarchy, this AF 70-300mm f/4-f/5.6 DG APO Macro, has none of the more elaborate 'bells and whistles' evident on the more expensive EX range. What does this mean? Well, you don't get Sigma's superb HSM (Hypersonic Motor) AF (auto-focusing) for near silent and very fast AF, resulting in a somewhat more unsophisticated, noisy (although not overly so) and slightly 'harsh' action. It still works well however! Also, you get no FTM (full time manual ...

davecham 29.12.2008 · Read full review
Ciao members have rated this review on average: very helpful
Review of Sigma telephoto zoom lens - 70 mm - 300 mm F/4.0-5.6