Tag : cameras, dc hsm, 20mm f, 6 ex, sigma 10, samsung slr
 |  Company : Sigma List Price : $569.00 Amazon Price : $425.00 Used Price : $1,063.21 Average customer review :  |
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Accessoies
- Lowepro Lens Case 1W (Black)
- Tiffen 77HTCGND6 77MM Digital HT Grad ND 0.6 Titanium Filter
- Adorama Professional Lens Cleaning Kit
- Sima CapKeeper 2 - Lens cap strap (pack of 3 )
Features
- 10-20mm ultra-wide angle lens designed for Pentax and Samsung 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
Product Description
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 with APS-C size image sensors of digital SLR cameras.Wide angle of view (102.4 ? at 10mm and 63.8 ? at 20mm) offers the photographer greater freedom of expression. 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 well as 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 full time 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.Customer reviews
Amazing lens! 
I've had this lens for four months now. I wanted to get a good feel for it before I signed off on it.
I have been completely impressed with this lens on my K10D. At 10mm, the lens is super wide, but doesn't distort images like a fisheye lens would, unless you get very close to your subject. At 20mm, there is very little noticeable distortion.
This lens is extremely sharp when shooting with a medium aperture, much sharper than I would have hoped for.
Overall, this is an incredible lens, and well worth the money.
A real wonder
Just perfect, wonderful pictures at an affordable price. the distortion is a real very minimal. I also have the PENTAX Fish-eye objectief smc DA 10-17mm f/3,5-4,5ED (IF), but that is pure for fun.
Very good lens. If you can focus it correctly. 
My first impression when I received a package with this lens was "Wow!".
This lens is very well built and it comes with a dedicated case.
There was an extended warranty from Sigma included with the lens in addition to the standard one. If I remember well, it was 4 or 5 years in total. Very good, Sigma!
The Sigma 10-20 mm f/4-5.6 EX lens for Pentax mount looks different from the picture on Amazon. It does not have the window for scale, instead the last one is just painted on the barrel. And certainly it is not HSM, but a "screwdriver" type.
It mounts and locks on my *istDs and K10D easily. Surprisingly, I still can rotate the lens in the mount (in locked position) to a small but noticeable degree. It seems that the lock mechanism on this lens has "extended" tolerance and/or the mount coupling lens-body is not tight enough. This is a bit annoying. The zoom barrel is stiff in operation, so it happens to me to push it a bit harder and so turn the lens in the mount.
Now a few words about the optical quality of this lens.
I read many reports stating that their copy of the lens was good, as well as the ones stating the opposite.
Although my copy of this lens is not as sharp as my prime lenses (which was expected), it is good. But there is one "BUT".
My lens is sharp provided it is focused correctly. This is something difficult to achieve in certain situations and especially at wider angles. With this lens the AF tends to lock elsewhere, but not on the subject. And often there is no consistency - even if I focus several times on the same subject which is 3 meters away, the AF may lock anywhere from 1 m to infinity.
I am not sure if this is the lens or the camera AF system which causes such behaviour. In most cases I just set the distance manually and rely on the DOF.
