Sigma 20MM F/1.4 DG ART Review

Sigma 20MM F/1.4 DG ART Review. Sigma presents a 20mm lens with a wide aperture. Sigma has several times released for a lens with a wide aperture for example 18-35mm f / 1.8 ART and 50-100mm f / 1.8 for the APS-C; 24-35mm f2 for full frame. Sigma 20mm F / 1.4 DG lens ART is becoming an alternative lens Zeiss Distagon 2.8 / 21mm. I was just giving the conclusions of the review canonrummors.

(+)
Class leading maximum aperture for the 20mm focal length
Class leading resolution for the focal length (particularly in the center)
Good flare resistance
Good color rendition
Good build quality
Chromatic abberations well controlled
Autofocus is quick in most situations
Good flare resistance
Nice sunstars
Reasonable price when compared to competitors
Includes a padded case

(-):
Disappointing coma performance
Lacks weather sealing of any kind
Curved front element precludes the use of traditional filters
Fixed lens hood means bulky lens cap
Largest and heaviest lens of class
Not as wide as other 20mm options
Heavy vignette
(source: Canonrumors.com)

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Sigma 30mm f/1.4 for APS-C

Sigma 30mm f/1.4 for APS-C. Sigma 30mm F/1.4 DC HSM With the new optical configuration of nine elements in eight groups, as well as the rounded aperture blades, lens sharpness updated providing fun and beautiful background bokeh with the 30mm lens is like the vision of the human eye.

Double-aspheric lens minimizes distortion ball, astigmatism and coma, and a rear focus system prevents focus deviation dependent variations. Together, the new optimized autofocus (AF) algorithm and a rear focus system ensures smooth and accurate focus. The new 30mm F1.4 is also compatible with the new Sigma USB Dock, which will allow firmware updates and focus adjustment.

Sigma 30mm f/1.4 for APS-C | Sigma Lens

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SIGMA 17-70mm F2.8-4 DC MACRO OS HSM

The SIGMA 17-70mm F2.8-4 DC MACRO OS HSM. for the standard lens is the most important coverage obtained. of several standard lens that feels much less meet the standard range. 

The SIGMA 17-70mm F2.8-4 DC MACRO OS HSM provides all the problems from standard lenses. such as the minimum focus distance is short, not long enough focal length for telephoto shooting. The SIGMA 17-70mm F2.8-4 DC MACRO OS HSM is suitable for daily needs and for specific shooting. This lens with a 2.8 aperture gives simplicity and very user-friendly will surely satisfy even the most demanding users.
Special Features
1. Contemporary line can handle all sorts of photo opportunities
2. Excellent for macro photography
3. 30% Smaller Than Conventional Models
4. Superior Image Quality Throughout The Entire Zoom Range
5. Large maximum aperture of F2.8
>>click here for full (from canon rumors.com) article 

SIGMA 17-70mm F2.8-4 DC MACRO OS HSM | Sigma Lens

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