Reviews and Problems with Sigma 105mm F2.8 EX DG OS HSM Macro
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Sigma 105mm f/2.8 EX DG OS HSM Macro Lens
The Digital Picture
13 December 2011
Excerpt: The 105mm f/2.8 EX DG OS HSM Macro Lens is Sigma's first macro lens to feature OS (Optical Stabilization) and replaces the Sigma 105mm f/2.8 EX DG Macro Lens . The Sigma 105 OS Macro lens has been in my kit for just over two years and has seen intermittently regular use. I have been quite pleased with the results the lens has delivered for me.
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.
The Sigma 105mm f/2.8 EX DG OS HSM Macro is an impressive lens that feels robust and handles well.
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. Typical for macro lenses distortions are a non-issue. You may spot a little vignetting at f/2.8 but beyond it's not issue anymore.
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. The quality of the bokeh (out-of-focus blur) is excellent except for the rather pronounced "cat's eyes" at the border of the image field.