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  • Sigma 20mm f/1.8 EX DG RF Aspherical Wide Angle Lens for Pentax and Samsung SLR Cameras
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Sigma 20mm f/1.8 EX DG RF Aspherical Wide Angle Lens for Pentax and Samsung SLR Cameras

by Sigma
54 customer reviews

Price: $629.00 & FREE Shipping. Details
Only 1 left in stock.
Ships from and sold by Amazon.com. Gift-wrap available.
Pentax and Samsung SLR Cameras
  • Sigma EX 1,8/20 DG P/AF asphérique RF

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4 new from $629.00 3 used from $459.95 1 refurbished from $640.00
$629.00 & FREE Shipping. Details Only 1 left in stock. Ships from and sold by Amazon.com. Gift-wrap available.

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Style: Pentax and Samsung SLR Cameras
  • Buy Used and Save: Buy a Used "Sigma 20mm f/1.8 EX DG RF Aspherical Wide Angle Le..." and save 26% off the $629.00 list price. Buy with confidence as the condition of this item and its timely delivery are guaranteed under the "Amazon A-to-z Guarantee". See all Used offers.
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  • 12 Month Financing: For a limited time, purchase $599 or more using the Amazon.com Store Card and pay no interest for 12 months on your entire order if paid in full in 12 months. Interest will be charged to your account from the purchase date if the promotional balance is not paid in full within 12 months. Minimum monthly payments required. Subject to credit approval. See complete details and restrictions.

Technical Details


Product Description

Style: Pentax and Samsung SLR Cameras

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. Minimum focus distance 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 94.5? angle of view allow close up photography surrounding the photographic subject. Handling 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. Incorporated aspherical lenses The use of aspherical lens elements in both of the front and rear lens groups effectively compensates for distortion, spherical aberration and astigmatism.

Product Details

Style: Pentax and Samsung SLR Cameras
  • Product Dimensions: 3.5 x 3.5 x 3.5 inches ; 1.2 pounds
  • Shipping Weight: 1.8 pounds (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B00005RKSN
  • Item model number: B00005RKSN
  • Average Customer Review: 4.3 out of 5 stars  See all reviews (54 customer reviews)
  • Amazon Best Sellers Rank:
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.
  • Discontinued by manufacturer: Yes
  • Date first available at Amazon.com: November 1, 2001

Read about our customers' top-rated lenses and cameras on our review pages: Lenses, Digital SLR Cameras, Compact System Cameras

Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

45 of 50 people found the following review helpful By Canon on May 7, 2006
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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23 of 25 people found the following review helpful By JoLo on August 16, 2010
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.
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9 of 9 people found the following review helpful By Quinton Smith on December 23, 2013
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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11 of 13 people found the following review helpful By William B. Newkirk on March 28, 2008
Style Name: Pentax and Samsung SLR Cameras
If you want to take indoor shots with your SLR, this lens will let in enough light to stop the action. It also will work on your film camera for those REALLY wide-angle shots. I typically use prime lenses for shooting indoor shots and this is one of the best, because of the wide angle (30mm equivalent), sharpness, and speed. No other wide lens has the speed of this one (f1.8). I have taken shots in DIM light without flash that have come out great. My best 3 lenses for indoors are this one, a Pentax 35mm F2.0, and a Pentax 50mm F1.4. I have a Sigma 28mm F1.8, but it is not as sharp or useful as this one. The only drawbacks are the size and the cost of a filter that fits this (82mm filters are NOT cheap).
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Sigma 20mm f/1.8 EX DG RF Aspherical Wide Angle Lens for Pentax and Samsung SLR Cameras
This item: Sigma 20mm f/1.8 EX DG RF Aspherical Wide Angle Lens for Pentax and Samsung SLR Cameras
Price: $629.00
Ships from and sold by Amazon.com
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