07-02-2015, 03:11 PM
Quote:Do you plan to review the new Contemporary version of the already reviewed 17-70/2.8-4 macro OS some day or are the differences just too small to justify another test procedure? The optical quality appears to be close to the Nikkor 16-85The optics are a new design.
Old 17-70mm OS:
![[Image: lens_structure.gif]](http://www.sigma.net.tw/lens/standard/17_70_28_4/images/lens_structure.gif)
![[Image: lens_aspherical.gif]](http://www.sigma.net.tw/lens/images/lens_aspherical.gif)
![[Image: lens_eld.gif]](http://www.sigma.net.tw/lens/images/lens_eld.gif)
New 17-70mm OS "C":
![[Image: construction_thumb.gif]](http://www.sigma-global.com/en/lenses/cas/product/contemporary/c_17_70_28_4/specifications/construction_thumb.gif)
![[Image: construction_pink.gif]](http://www.sigma-global.com/en/lenses/cas/product/images/common/construction_pink.gif)
![[Image: construction_orange.gif]](http://www.sigma-global.com/en/lenses/cas/product/images/common/construction_orange.gif)
![[Image: construction_blue.gif]](http://www.sigma-global.com/en/lenses/cas/product/images/common/construction_blue.gif)
So, the differences are not small.