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Comment: Very good condition in full retail packaging. Includes Sigma 20mm EX DG RF Aspherical lens for Nikon camera bodies, Sigma lens hood, Sigma nylon lens case, lens caps, paperwork, warranty card and retail box (also in great condition). MF is a bit loud. Fast shipping - we ship the same day that we receive your order.
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Sigma 20mm f/1.8 EX DG RF Aspherical Wide Angle Lens for Nikon SLR Cameras

3.8 out of 5 stars 59 customer reviews
| 16 answered questions

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Nikon SLR Cameras
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  • Lens Construction: 13 Elements in 11 Groups Angle of View: 94.5 degrees Number of Diaphragm Blades:
5 used from $449.99

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Technical Details

Product Description

Style: Nikon SLR Cameras

Product Description

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 Sigma 20mm super-wide-angle lens provides minimal light falloff and superior peripheral brightness, helping you take masterful landscape shots or large family portraits. The lens is equipped with a high-quality Dual-Focus (DF) mechanism. The DF system makes it easy to hold the lens, as the focusing ring doesn't rotate during autofocus. At the same time, however, the lens still provides adequate torque for manual focusing operations. By incorporating a rear focusing system, Sigma made the lens compatible with petal-type hoods, which offer superior light blocking effects. In addition, the lens offers a super multi coating that reduces the flare and ghosting that often occurs in digital cameras, along with nine diaphragm blades to help you obtain beautiful out-of-focus images in the foreground and background. Other features include a minimum focusing distance of 7.9 inches, a maximum magnification ratio of 1:4, aspherical lens elements in the front and rear lens groups to compensate for distortion and spherical aberration, and a 94.5-degree angle of view.


  • Focal length: 20mm
  • Maximum aperture: f/1.8
  • Lens construction: 13 elements in 11 groups
  • Angle of view: 94.5 degrees
  • Number of diaphragm blades: 9
  • Minimum aperture: f/22
  • Minimum focusing distance: 7.9 inches
  • Maximum magnification: 1:4
  • Filter size: 82mm
  • Mount: Nikon
  • Dimensions: 3.5 inches in diameter and 3.5 inches long
  • Weight: 18.3 ounces
  • Warranty: 1 year

Product Information

Style:Nikon SLR Cameras
Product Dimensions 3.5 x 3.5 x 3.5 inches
Item Weight 1.1 pounds
Shipping Weight 1.8 pounds
Item model number 411110
Customer Reviews
3.8 out of 5 stars 59 customer reviews

3.8 out of 5 stars
Best Sellers Rank #526 in Camera & Photo > Lenses > Camera Lenses > Digital Camera Lenses
Date first available at November 1, 2001

Warranty & Support

Product Warranty: For warranty information about this product, please click here


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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Style Name: Canon Digital SLR Cameras
I have used this lens extensively with the 1D and the Rebel XT. Results have been excellent. My suspicion is that the previous reviewer got a defective or damaged copy of the lens. It is incredibly sharp, even at f1.8, which I did not expect - generally you expect a lens to be a bit soft wide open, especially 1.8. The degree of sharpness of this lens is quite surprising.

I have used, for example, both the Canon 50mm f1.8 and the Canon 35mm f2.0, both of which are deservedly renowned for their sharpness and contrast. I find this lens to be sharper than either of them wide open. The lens provides images which have excellent color saturation and contrast. Of course, at f1.8, depth of field is razor thin, by design, which is great for bokeh or out of focus background, but which also requires care concerning the desired focal point being in focus. Speaking of bokeh, I find it to be very attractive compared to any other lens I have used.

Its minimum distance focusing is also quite remarkable. I think it is rated at just under 8 inches, but I routinely focus at distances which seem a good bit closer than that. The lens works well as a macro for many applications, with a relatively strong multiplication factor.

Of course, given the inherent light-gathering of a 20mm focal length lens, combined with a huge aperture of f1.8, this lens is outstanding for shooting indoors or in other low-light situations with natural light and no flash.

Canon's nearest competitor to this lens is the 20mm f2.8, which is a full stop slower in terms of light collection. I consider this lens to be an extremely good value at the retail price, new. If you can get a good copy used on-line, it will be an incredible value.
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Style Name: Canon Digital SLR Cameras Verified Purchase
I purchased the Sigma 20mm f/1.8 lens, mainly for wide field astrophotography purposes. I refuse to pay what Canon was asking for a comparable lens...this Sigma lens costs less than half of what Canon charges. I can tell you the quality is top notch - well built, very sharp images across the field, easy to use and transport. The two issues I knew about before purchase - the autofocus is a bit rough and noisy compared to the Canon and you have to engage the focus ring for manual focussing - were no surprise, and really not much in the way of issues anyway. The autofocus with the Sigma is a bit noisier than the smooth Canon lens, and is remembering to move the focus ring when manually focusing really a hassle? Some reviewers made it sound horrible, but for saving over $500 I will put up with a little noise and a focus ring......

I captured some fanstastic shots of the Perseid meteor shower while camping at Joshua Tree in early August - the Sigma performed flawlessly. I recommend this lens without reservation.
4 Comments 26 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Style Name: Nikon SLR Cameras
This is actually my first review, and I feel that this lens is fitting for it. I've only been shooting "professionally" (i.e., for real, actual money) for about a year, which has included shooting second at a number of weddings, and covering several events, portrait sessions, and a couple of concerts/gigs. I have a preference for prime lenses, and I just so happened to come across a good deal on a used copy of this lens at a local camera shop when I was looking for something wide. My test shots with it at the shop looked pretty good, and some quick Google-fu research revealed favorable reviews, so I snapped it up. After about 6 months shooting with it, it has become one of the most highly favored items in my bag.

Its width is indispensable for landscapes, location shots, group shots, setting pictures, crowd shots, etc. When the lighting is interesting, the speed also allows for great shots without the flash, thus preserving the character and ambiance of the scene. An example can be seen here: [...] (shot with Nikon D700 at f1.8, 1/160sec, ISO 8000). It also allows for some pretty close focusing, which can in turn lead to some interesting options for composition (depending on how close you can get to your subject). I've found this to be a pretty sharp piece of glass, even when wide open, at least on my 12MP D700. Some reviews have cited that this older lens may not have the ability to keep up with the resolution of newer sensors, however, but I've no experience with that. When at f1.8 the corners are admittedly a bit soft, but its nothing I wouldn't expect from a 20mm anyway, especially one at that aperture (if there were even one in existence). As with most fast primes, stopping down to the f2.8 - f4 range sharpens things up exponentially.
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Style Name: Canon Digital SLR Cameras Verified Purchase
I bought this lens strictly for shooting stars. Good (not great) value for the money. There aren't many wide lenses out there this fast. It works well for stars. I'm able to get 2 more stops of shutter speed compared to my f/2.8 lenses. A big plus in my opinion. On the down side, this lens vignettes badly at anything wider than f/3.5. Not a huge issue when the scene is mostly dark and I typically add vignetting to some degree in post processing. The AF system is very clunky. Flip a switch AND the focus barrel?? Again, not a huge deal for me as I keep this lens on manual focus for shooting stars.
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