10-20mm F4-5.6 EX DC HSM lens allows enjoyment of super wide-angle photography and it is a very powerful tool for indoor shooting and landscape photography Wide angle of view (102.4°at 10mm and 63.8°at 20mm) offers the photographer greater freedom of expression. These are special DC Seriesd Lenses designed so that the image circle matches the smaller size of the image sensor of most digital SLR cameras.Their specialized design gives these lenses the ideal properties for digital cameras, the compact and lightweight construction is anadded bonus ! including compact and lightweight construction. Three SLD glass elements are employed for effective compensation of color aberration, which is a common problem with super-wide angle lenses. One piece of glass mold and two hybrid aspherical lenses, offer excellent correction for distortion, as wellas all types of aberration. This lens is equipped with an inner focusing system, and the models which are equipped with HSM system provide quiet, high speed autofocus shooting and also offer fulltime manual focusing. It has a minimum focusing distance of 24cm (9.4") at all focal lengths. The non-rotating lens barrel perfectly suits the petal shaped lens hood. A circular polarizing filter can also be used conveniently. Please note: Vignetting will occur if the lens is used with digital cameras with image sensors larger than APS-C size or 35mm SLR cameras.
Designed exclusively for Canon digital SLR cameras, the ultra-wide-angle 10-20mm offers a view from 102.4 to 63.8 degrees, making it ideal for landscape photography and other vast applications. The lens is distinguished by its three special low dispersion (SLD) glass elements, which effectively compensate for color aberration, and its aspherical lenses, which provide maximum correction for distortion and various aberrations. As a result, the lens produces an extremely high image quality throughout the entire zoom range. The HSM-equipped models, meanwhile, produce fast autofocus (AF) speeds and quiet shooting while still letting you perform full-time manual focus. Other details include a minimum focusing distance of 9.4 inches at all focal lengths and an integral petal-type hood to block out extraneous light.

Lens Elements and Coating
The new multilayer lens coating and lens design reduce flare and ghost--a common problem with digital cameras--while also creating an optimal color balance throughout the entire zoom range. At the same time, the lens offers three SLD glass elements that effectively compensate for color aberration, along with a piece of glass mold and two hybrid aspherical lenses that offer excellent correction for distortion and all types of aberration.

Inner Focusing System and HSM
The lens incorporates an internal focusing system that eliminates front lens rotation, letting you use a petal-type hood to protect from additional glare. And models equipped with a Hyper-Sonic Motor (HSM) produce silent, high-speed autofocus and full-time manual focus for Sigma, Canon, and Nikon D-mount lenses.

Best Consumer Lens
The Sigma 10-20mm lens is so respected that it was named the best consumer lens in Europe (2006) by the Technical Image Press Association (TIPA), a collection of 31 publications from 12 countries. According to TIPA, the 10-20mm lens offers a versatile range of wide-angle focal lengths, a good optical performance, and a budget price, making it an excellent investment for owners of DSLRs with APS-C format sensors. Its sharpness remains constant throughout the zoom range, and its compact size makes it an ideal companion for shooting travel, landscapes, or architectural subjects.

• Lens construction: 14 elements in 10 groups
• Angle of view: 102.4 to 63.8 degrees
• Number of diaphragm blades: 6
• Minimum aperture: f/22
• Minimum focusing distance: 9.4 inches
• Maximum magnification: 1:6.7
• Filter size: 77mm
• Dimensions: 3.3 inches in diameter and 3.2 inches long
• Weight: 16.4 ounces

Technical Details

-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
See more technical details

 "Read dpreview before you buy" 2010-07-28
By J. Huang (New Haven, CT USA)
Mechanically well constructed. Come with pinch-type lens cap and hood, as well as boxy carrying case you can thread onto a belt or rigging.

I wasn't going to spend extra money for the Canon glass since I anticipate using this lens only occasionally. I figured I'd go with the Sigma over the Tamron because the Tamron is a 77 mm filter while the Sigma shares a 72 mm filter with my main everyday lens. I fully read the review on dpreview about the lens' performance at various apertures, but I wasn't prepared for how soft the picture looked at 10mm F4! Don't rush to return your lens if you're surprised by the poor quality of the test shot, try F11 or F13 where the lens performs the best. This does mean that I'll have to be more thoughtful capturing a landscape than just setting the aperture to F22 and firing away. No quality problems in my copy when stopped down, unlike other mentions here.


 "Sigma 10-20mm" 2010-07-26
By ameliaPerry00
This lens is amazing, strong, durable, and makes some awesome picture. I am an amateur photographer and bought this lens for a trip to Wyoming. I have a Nikon D60 but it is a beast and this lens makes my pictures look professional. I have taken some amazing pics of Yellowstone, Devils Tower, and the mountains of Wyoming. The quality of the picture sometimes lacks, but nothing that can't be fixed by photoshop or lightroom and for less than 500 bucks it is one cheapest and best wide angles you can get. You can also take some very interesting close up pics (for example I take close ups pics of my pets) with this lens but you have to have an external flash.

I say this lens is durable because it has been dropped twice. Once on the concrete path at Devils Tower, it got knocked out of my coat pocket while changing lens and the second time got knocked of the car seat and then stepped on by somebody that wasn't paying attention and the filter got smashed into a million pieces. So to say the least it has been through a lot. but it still works perfectly which is a miracle in itself.

If you are like me and don't have much money and want a wide angle lens this is a the way to go and you will not be disappointed. I recommend you buy it a filter for protection (Zeikos sells a 77mm for 8 bucks and it is what saved my lens) and it comes with it's own case so keep it in it's case when not in use.



 "Bought this lens used from Amazon Warehouse Deals" 2010-07-09
By S. Cain (Virginia Beach)
After spending countless hours reviewing the various UWA lenses, I settled on this Sigma 10-20mm lens. It isn't the fastest wide angle out there, but it is the only one at 10mm focal length at it's widest setting. After all, If you are going to buy a wide angle lens, why not buy the widest available (yet still affordable). I paid extra for next day shipping and the lens arrived promptly at 2:00 pm the next day. Although this is an Amazon purchase, I found the copy I bought from Amazon Warehouse deals, sold as a USED lens. The price was $80 less than brand new so I figured I'd give it a try, knowing that I could always return it if it was not in good shape.

When the package arrived, I expected to open the box and see a used lens wrapped in paper or bubble wrap. I was surprised to find that the lens came in the original box with original warranty card still in place. But best of all, this lens appeared to be new in every way. There were a few fingerprints on the front element which I took care of with a lens tissue, but other than that, there was not so much as a hint of wear or handling issues.

But the real test is how this lens works (or not works). I put it on my D90 and it instantly recognized the lens and was ready to go.

So far, I have taken about a hundred test images to be sure I got a good copy of this lens. I was particularly impressed when i took a picture of the front of my wife's Ford Escape at 10mm and about 6 feet away. After bringing the image into my PC, The photo was tack sharp but the real surprise was that I could read the serial number on the small decals of her license plate as if I had used my sharpest Nikon fixed focal length lens.

I am so pleased that Amazon's warehouse Deals had this (used?) lens for sale the day I decided to purchase one. If I didn't know better, and if there had not been finger prints on the front element when I opened the box, I would have sworn that this lens was brand new.

Great job Amazon.

Al C., Professional Photographer


 "Crap! Go with Canon or Tokina" 2010-07-04
By Neal Westfall
I bought this lens never was happy with the results. Not very sharp and to much distortion. Very nice wide angle, but I did not feel the optics were very good. Recently purchased the Tokina 12-24 and could not be more happy! Only thing better would either be the Canon 10-22 or the Tokina 11-16. Save you money and buy one of these. I use my wide angle more then my kit, and it is worth investing in.


 "Great bang for the buck!!!" 2010-06-27
By Jorge Ivan Matos Rodriguez (Miami, Florida United States)
Bought this lense a couple of weeks ago and works like a charm. Great crisp and fast autofocus. The only small problem that I have with it, is that the f stop only goes to 4. Doesnt work that well in low light without a tripode. I have used the Canon equivalent and in comparisson this stacks up pretty well.


Read more Sigma 10-20mm f/4-5.6 EX DC HSM Lens for Canon Digital SLR Cameras

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