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Review Summary
2009-08-09T21:00:00
This lens is sharp and tasty for landscape, portrait with a group of people, blue hour fotographing. I´ve tested it on deers in the dark swedish summernight´s, togheter with a tripod and a good camera just like Sony A900 it works overall well. The F1.8 is very good to have when the light disapere.
Mikael R.
2008-08-07T21:00:00
I got this because I needed a fast, wide-angle for a series of group pictures and indoor event pictures where I didn't want to have to rely on a flash. This has not disappointed. I've been able to use this for gymnastics action shots in a gymn that has lousy light, too. The size is a bit of an issue -- I don't have a pocket big enough for it on a summertime shirt and the filter is a monster -- but it's a small deficit when considering all the positives.
David R.
2007-08-23T21:00:00
When I got my Pentax K-10-D, once again my next objective was to buy a bright wide angle lens (Zooms Can't Cut It In Low Light). When I step into a Big Old Granite Building I come out with better shots than if I had put a flash on my camera and settled for the coverage it got. This lens is great on my D.S.L.R. and even better on my 35mm.S.L.R. and it takes the same Sigma polarizing filter as the 100mm to 300mm Lens and 24mm to 70mm Lens I planed on buying after it.
DanJohnson
2007-02-11T19:00:00
I love this lens for taking interior shots when I wanted to get as much of a room as I wanted without using flash. It is sharp and gives excellent results.
BONNIE D.
2007-01-01T19:00:00
Indoor shots without flash is now a reality with this lens, especially with digital cameras, where you can tweak the white balance. On a digital, you have a respectable 30mm equivalent wide lens at F/1.8. On a film camera you have a breathtaking 20mm. It will also focus to a 1:4 macro ratio, giving you an amazing perspective (and depth of field) that you can't get with a normal lens. The only drawback I have found is that the lens is not small (the size of many zooms, but it doesn't "stretch-out" like most zooms obnoxiously do) and the filter size is an expensive 82mm. But you don't get F/1.8 without that kind of size. Don't try the lens. You'll never go back to the dark world of slow zooms again. . .
Bill N.
11 groups /13 elements
94.5°
22
20cm / 7.9"
1:4
82mm
88.5 x 87mm / 3.5 x 3.4"
520g / 18.3oz.
085126411343

Sigma 20mm f1.8 Ex DG Aspherical RF is one of several EX Series lenses. It is the first 20mm Super wide-angle lens in the world with a large aperture of F1.8 and angle of view 94.5°. It has Macro focusing capability with a minimum focusing distance of 20cm/7.9inches (reproduction ratio 1:4).
The iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus image. It incorporates an aspherical lens element in the front as well as rear lens groups, to minimize distortion, spherical aberration and astigmatism.
The lens has non-vignetting optical construction, in order to obtain adequate peripheral brightness with open aperture. This is especially desirable for digital cameras. The lens incorporates a rear focus system eliminating front lens rotation, thus allowing the use of a Perfect Hood and easy use of polarizing filters.
The lens also incorporates dual-focus 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 lens materials used in this lens are lead and arsenic free ecological glass.
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