Conclusion: Focus is confirmed well and without hesitation, while the distance window displays both distance and magnification clearly. On such a long lens the manual focusing ring is quite a fair distance away from the camera body, which makes using it while supporting the camera a little tricky.
Pros: Excellent functionality, Impressive performance, Image stabilisation system, Good magnification
Excerpt: Speaking to the guys here ... If you buy a macro lens, you will want to get your wife flowers. If you get your wife flowers, she will be happy. And if your lens makes your wife happy, she will want you to buy more lenses. You can see the perfect win-win circle forming here.
Excerpt: A ruggedly constructed, large-aperture, full-frame, image-stabilized, 1:1 close-up lens, this medium telephoto prime ($970, street) converts up to about 150mm on Sigma’s SD1, as well as on most DSLR cameras with APS-C sensors.Its attractions include a nonrotating barrel suitable for lens-mounted...
Summary: THE 105MM standard macro focal length is more suited to full-frame sensors, so producing a premium-positioned lens makes sense. For APS-C cameras, Sigma's 70mm macro gives an effective 105mm or 112mm for Canon users and is therefore a better focal length.
Conclusion: Although it's not the cheapest of lenses, the Sigma 105mm macro proved to be worth its price-tag. The HyperSonic Motor provided the fastest and most accurate AF and the Optical Stabilizer was invaluable for handheld shots, but where the lens really excelled was in the image quality it produced.
Sigma AF 105mm f/2.8 EX HSM DG OS macro (Canon EOS) - APS-C Format Review
9 December 2011
Conclusion: The Sigma AF 105mm f/2.8 EX DG HSM OS macro is an impressive lens - both on in its native full format scope and even more so on APS-C format cameras. The APS-C resolution characteristic is great even at f/2.8 and the high quality is basically kept till about f/11.
Sigma AF 105mm f/2.8 EX HSM DG OS macro (Canon EOS) - Full Format Review
6 December 2011
Conclusion: The Sigma AF 105mm f/2.8 EX DG HSM OS macro is an impressive lens. The resolution is generally very high although the border quality could be a little better at large aperture settings. Typical for macro lenses distortions are a non-issue. Vignetting is only a real problem at f/2.8.
Excerpt: If I had to name one category of lenses in which the competition is the most fierce and the most balanced at the same time, I would point at 100 mm macro class without any hesitation. There are no weak instruments here.
Cons: Weak work against bright light,, High vignetting on full frame,, Autofocus noticeably slower than that of its rivals.