10-20mm ultra-wide angle lens designed exclusively for Canon digital SLR cameras
3 special low dispersion (SLD) glass elements to compensate for color aberration
Hyper-Sonic Motor (HSM) produces silent, high-speed autofocus; full-time manual focus
Multilayer lens coating reduces flare and ghost; 9.4-inch close focusing distance
Measures 3.3 inches in diameter and 3.2 inches long; weighs 16.4 ounces
This review is from: Sigma 10-20mm f/4-5.6 EX DC HSM Lens for Canon Digital SLR Camerasthere are currently 4 wide angle zoom choices available on the EF-S canon mount (d-rebel/xt/20d) canon 10-22, Sigma 12-24, sigma 10-20, tokina 12-24. Of these, sigma 12-24 is the only one which is usuable on a full frame sensor (canon 1d, 5d, possible future cameras). There is sizable difference in field of view between the 10 mm, and 12 mm. and the tokina is closer to 13 mm on its wide end. The sigma retails for about 2/3 the price of the canon. Optically they are very similar, with the canon having a larger maximum aperature, which is generally not important in a wide angle lens. The built construction is EX, they higher line of sigma, and it excellent. The focus motor is HSM, making it fast, and very accurate. Resolution chart show the sharpness to be very close to that of canon. The color and contrast is excellent, the flare and chromatic abberation genenrally well controlled. A fun lens to use, and excellent value....
This review is from: Sigma 10-20mm f/4-5.6 EX DC HSM Lens for Canon Digital SLR CamerasIf you are looking good quality and price ultra wide lens for APC-C senser size digital SLR, this lens is a very good choice. Canon also has an EF-S 10-22mm f/3.5-4.5 USM lens. However the price is more than $700. Here is a Sigma, 10-20mm f/4-5.6 EX DC HSM. Sure it's little bit dark than Canon, but it's OK. Usally ultra-wide lens are used at outdoor. The photo is very sharp image and you can take a shot without cropping. And minimum focusing distance if 9.4" (24cm), you can make fun photos! Sigma also provice lens hood and carring case for free!...
This review is from: Sigma 10-20mm f/4-5.6 EX DC HSM Lens for Canon Digital SLR CamerasI wanted an ultra wide angle lens for my new Canon EOS 40D, but I didn't have the money to purchase a high cost Canon ultra wide lens. Careful research kept pointing to the Sigma 10-20mm f/4-5.6 EX DS HSM lens. At 4 to 5.6, this lens is slightly dark, but for an outdoor lens I figured lighting wouldn't be much of an issue. With a range of 10 to 20mm I decided this lens would offer very wide shots and near fish-eye creativity capabilities.I always buy only Canon lenses, but I don't buy the professional level models. After all, I am a photo hobbyist, not a professional photographer. Well even though I really wanted to purchase a quality ultra-wide angle lens, I was low on funds due to recently over spending on Christmas gifts for my friends and family. Although I wanted to buy a Canon ultra-wide, I just didn't have that kind of cash. I read several rave reviews on this Sigma 10-20mm lens so I ordered one up. I haven't had it very long but I have taken several photos with this lens and so far I am quite impressed. At 10mm you do get some curved distortions, giving a bit of a fisheye effect. This can be good or bad, depending on what you are looking for in your shot. As another reviewer pointed out, this effect can make clouds look wonderful. This is an EX series Sigma, with a super fast HSM auto focus. The focusing is quick and accurate. The filter size is 77mm, which is HUGE, and filters can be quite expensive, but for what you save on the cost of the lens you can afford to invest in quality UV and polarizer filters. This lens is also fairly light weight and very classy looking. The shiny gold ring is a nice touch indeed. I also really love the fact that this lens comes with a lens hood and a nice padded case. I only have a couple of minor complaints, neither of which would cause me to reduce my rating. First and most distracting is the fact that the focus and zoom rings are reversed, compaired to the Canon lenses, so I find myself constantly adjusting focus when I mean to adjust zoom. This is something that I will get used to and certainly does not affect the overall quality of the lens. Secondly, with the lens stored in its squarish, padded case, it makes the whole package a bit large and I cannot fit it in my camera bag. So, with all of this being said I have to give this Sigma EX series 10-20mm lens a solid 5 stars. The optics produce quality photographs, the overall feel of the lens is perfect, and the price is substantially less than the closest Canon equivalent. 5 stars may seem a bit high to some people, who feel that only the most perfect, professional lenses deserve this high of a score. But I feel that the quality and performance of this lens merrits a perfect score. For the average consumer photographer there just isn't a better ultra-wide lens on the market today. It even scores better than the Canon ultra-wides! I couldn't be happier with my new Sigma EX 10-20mm, and I highly recommend it to anyone looking for an excellent ultra-wide lens....
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