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Sigma 20mm F1.8 EX DG Aspherical RF Super Wide Angle

Sigma 20mm F1.8 EX DG Aspherical RF Super Wide Angle
alaAverage 3.5

2 reviews

Oct, 2017

alaTest has collected and analyzed 2 reviews of Sigma 20mm F1.8 EX DG Aspherical RF Super Wide Angle. The average rating for this product is 3.5/5, compared to an average rating of 4.4/5 for other Lenses & Filters for all reviews.

On average, users rate this product 70/100.

Review analysis

(Based on 2 reviews)

User Reviews  


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Consumer review by: (

I compared it with a Caon 24mm f /1.4L, and chose ...


I compared it with a Caon 24mm f /1.4L, and chose this over the Canon. The reason was that I could not tell which lens took which pic. In addition, while the USM of the Canon was quick and quiet, it hunted more than the Sigma. Lastly, the 20mm of the...

Sharp, sharp, sharp. Distortion free on 1.3 crop and corners are sharp too ;

1.8 is soft but still better than many zooms at f2.8 ;

Feb, 2005

Consumer review by: (

Sigma 20mm f/1.8 EX DG Aspherical RF Wide Angle Lens For Canon


Fast f/1.8 aperature, quality build, sharp at f/1.8 and very sharp at f/2.8 and higher ;

Slow and noisy autofocus -- HSM would be much better, must flip switch and slide focusing collar to switch to/from manual focus, 82mm filter ;

Product Specifications

This super-wide-angle lens is ensured minimal light-fall-off with superior peripheral brightness. The iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus images in the foreground and background. This is an ideal DG lens optimized Digital SLR camera. The minimum focusing distance of this lens is 20cm (7.9 inch) and it has maximum magnification of 1:4 with fast F 1.8 maximum aperture. The minimum focusing distance of 20cm (7.9 inch) and 94.5i angle of view allow close up photography surrounding the photographic subject. The lens incorporates Dual-Focus (DF) mechanism. It is easy to hold the lens, since the focusing ring does not rotate during auto-focus, yet it provides adequate focusing torque of the focusing ring during manual focusing of the lens. The rear focus system eliminates the need for the front of the lens to rotate, thus allowing the use of a "Petal-type hood", which is superior light blocking effect. The use of aspherical lens elements in both of the front and rear lens groups effectively compensates for distortion, spherical aberration and astigmatism.