Advantages: Range. Price. Decent quality. Disadvantages: More humble features than EX Sigmas. Rotating filter mount.
...or a 119-510mm f/4-f/5.6 with Sigma DSLR cameras. A good, useful range of focal lengths and particularly appealing for sports and wildlife photographers I would think. Closest 'normal' focusing distance is 1.5 metres, providing a magnification of 1:4.1 at 300mm. However, upon switching a small manual 'macro' switch - limited to use between 200 to 300mm only, it becomes possible to achieve an improved magnification ratio of 1:2 or half life-size. ... ...- normally considered to be 1:1 or actual 'life-size'. Still impressive however.
Performance wise, distortion is held to quite low levels throughout the zoom range. At 70mm, there is just a little barrel distortion, but nothing to cause concern. The lens becomes pretty neutral at around 140mm focal length then changes to pincushion distortion from around 200 to 300mm focal length. Once again, this is not too serious and is in fact, a pretty good ...
davecham 30.12.2008
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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
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.
...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, ... ...more troublesome to use.
Sigma market this lens as an APOchromatic lens which I suspect, is slightly exaggerating the reality. In fact, they do use two SLD (Special Low Dispersion) elements in the design which comprises 14 elements in all, in 10 groups and, I have no doubt it is this, that 'lifts' the performance of the lens above that of it's less well endowed sibling - the non APO version. It also benefits from improved lens coatings, enhancing ...
davecham 29.12.2008
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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
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