The Sigma 20mm F1.8 EX DG Aspherical Macro is a standard wide-angle lens for full-frame and APS-C digital SLRs. Although not a new lens, it remains popular for its combination of good build quality, a usefully fast aperture of F1.8 and decent optics. You don't get Sigma's HSM ultrasonic-type autofocus motor but a clever manual/auto focus clutch gives quick access to manual focus if you need to fine-tune.
Sigma 20mm f/1.8 EX DG RF Aspherical Lens
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- 20mm focal length
- 30mm equivalent focal length on APS-C cameras, 32mm equivalent focal length on Canon APS-C cameras
- F1.8 maximum aperture; F22 minimum
- 82mm filters
- 0.20m/7.87" minimum focus
- Available in Canon EF, Nikon F (FX), Pentax KAF, Sony Alpha, Sigma SA mounts
|Lens type||Prime lens|
|Max Format size||35mm FF|
|Focal length||20 mm|
|Lens mount||Canon EF, Nikon F (FX), Pentax KAF, Sigma SA Bayonet, Sony/Minolta Alpha|
|Number of diaphragm blades||9|
|Special elements / coatings||2 aspherical elements|
|Minimum focus||0.20 m (7.87″)|
|Full time manual||Yes|
|Focus notes||dual focus mechanism|
|Weight||520 g (1.15 lb)|
|Diameter||89 mm (3.49″)|
|Length||90 mm (3.52″)|
|Filter thread||82 mm|
|Hood product code||petal type hood|
great lens for the price
This lens is great for landscapes, very sharp, even good in the corners where I use it--on a tripod at f5.6-8. the build is not superior but adequate. The performance is as good as much more expensive lenses.
Sigma 20mm F 1.8
This is a very good lens,its at 1.8 wide open already very sharp.ofcourse it has light falloff in the corners bud thats something every fast wideangle lens has.at 4.0 this problem has solfed.Ate F 5.6 itz RAZOR SHARP from edge to edge. Forget all the other revieuws,I have one myself, i now what i am talking aboud.Other revieuw websites always debunk Sigma because they are sponserd by Canon and Nikon too do so and too promote their own products.I defenily advies too buy this lens.,itz very ...
Great lens for what it is
This lens is a mixed bag for sure. For what it is its pretty impressive. On Full Frame its pretty much one of if not "the" fastest ultra wide angle lens. I would not really want to use this on crop sensor cameras, its not worth the trade offs. This lens has the old manual focus clutch, switch system, which I have never liked. Further the ring is so big its really easy to pick it up and change from MF to AF. At 1.8 the edges aren't great, but the center is. But hey it can do 1.8 what else can? ...
Good wide angle lens
Very good for close up at f1,8, very soft corners and some CA, better at f2,8. Central resolution and acutance are excellent from f4 to f8, corners are good from f5,6 to f11. CA and distortion are low.Acutance is very good. Resolution is low at f1,8 and f2,8. Vignetting is important up to f2,8. AF is good.
"Beginning July 1, 2013, all brand new Sigma Products purchased from authorized Sigma dealers are covered under the 1 year America warranty (North and South America) and U.S.A. extended warranties for a period of three (3) years against defects in manufacturing and workmanship only. Your warranty period begins the day you purchase your Sigma camera, lens and/or flash and runs for a total period of four years from that date (please refer to the warranty policy included with your product)."