Sigma 17-70mm F2.8-4.5 DC Macro
| Maker | Sigma |
| Model | 17-70mm F2.8-4.5 DC Macro |
| Fullframe Coverage | NO - APS-C coverage only |
| Field of View
(degrees) Horizontal,Vertical, Diagonal Full Frame - 36x24mm APS-C - 22.5x15mm |
Full Frame Wide : H - 93.3 : V - 70.4 : D - 103.7 Full Frame Tele : H - 28.8 : V - 19.5 : D - 34.4 APS-C Wide : H - 67 : V - 47.6 : D - 77 APS-C Tele : H - 18.3 : V - 12.2 : D - 21.9 |
| Min Focal Length | 17 mm (APS-C 35mm equiv = 27.2 mm) |
| Max Focal Length | 70 mm (APS-C 35mm equiv = 112 mm) |
| Max Aperture (Wide-Tele) | f2.8 - f4.5 |
| Elements/Groups | 15/12 |
| Diaphragm blades | 7 |
| Close Focus | 0.2 m : 0.7 ft |
| Maximum Magnification | 0.43x |
| Length/Diameter | 3.2"/3.1" : 81.3 mm / 78.7 mm |
| Weight | 16 oz : 454.4 gm |
| Filter | 72 |
| Status | current |
| LensPlay Rating | 8 - Good |
| User Rating # of ratings = 206 |
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| Price (click for latest pricing) | $340 |
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COMMENTS: Good optics at a reasonable price. Certainly an alternative to the cheaper and slower (and more limited zoom range) Canon EF-S 18-55/3.5-5.6 "kit" lens. The apertures change as you zoom as follows:17-20mm f2.8 ; 21-24mm f3.2 ; 25-34mm f3.5 ; 35-54mm f4.0 ; 55-70mm f4.5 It has a wider zoom range than the f2.8 constant aperture zooms (17/18-50/55) and it's faster than the Canon EF-S 17-85IS, plus the price is lower than either. It doesn't have IS or USM, but then you can't have everything! The almost 1/2 lifsize (0.43x) "macro" performance may also be a plus.
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