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Sigma 17-70mm F2.8-4.5 Lens F/Pentax

Sigma 17-70mm F2.8-4.5 Lens F/Pentax $339.99 At Ritz Camera on 2-12-2011.

The new AF 17-70mm f/2.8-4.5 DC Macro is a highly anticipated Lens especially among Canon users seeking for a higher quality, affordable alternative to the original Canon EF-S 18-55mm f/3.5-5.6 or EF-S 17-85mm f/4-5.6 USM IS. In fact the interest in the Photozone forum was big enough to purchase the Lens for testing rather than loaning it from users like you which is the usual approach for the local Lens tests. The is a DC ("Digital Camera") Lens specifically designed for the reduced image circle of today's APS-C DSLRs where its field-of-view is equivalent to 27-112mm on classic full frame SLRs. The Lens is available in Canon EOS, Nikon and native mount. As usual an EOS 350D was used for testing purposes. The optical construction is made of 15 elements in 12 groups with 2 aspherical and one SLD (Special Low Dispersion) element. The aperture mechanism features 7 aperture blades. The min. focus distance of 0.20m resulting in a max. magnification of 1:2.3. The has no floating elements for close focus correction so don't expect wonders at extreme close focus settings. The Lens extends signifiCanontly during zooming (see below) reaching its max. length at 70mm. Despite the quite large max. aperture the Lens is still pretty compact and light-weight at only 79x83mm and 455g respectively. It's interesting that the AF 17-70mm DC is marginally bigger than the AF 18-50mm f/2.8 EX both regarding physical size as well as filter diameter (72mm vs 67mm) . A petal-shaped hood is part of the package. has positioned the AF 17-70mm f/2.8-4.5 DC Macro in one of the sweet spots of the market. It is priced beyond the (usually pretty crappy) kit zooms yet it still remains within the reach of budget shoppers. Even better than that it delivers a performance which matches and sometimes even exceeds more expensive Lenses. This includes the in-house competition (AF 18-50mm f/2.8 EX) as well as genuine brand Lenses (such as the Canon EF-S 17-85mm f/4-5.6 USM IS). All in all the Lens has only one really weak spot - 17mm at wide-open aperture where the extreme border performance is soft and vignetting is quite pronounced (but still not worse than the direct competition). At medium aperture settings the delivered quality is very impressive. Combine that with the quite decent build quality and fast AF and it doesn't need a genius to foresee that this Lens will be a quite hot seller.Additional popular products: Back To Top Sigma 17-70mm F2.8-4.5 Lens F/Pentax Available from Ritz Camera Price: $339.99 Updated on 2-12-2011.

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