Sigma 10-20mm f/4-5.6 EX DC HSM Lens for Nikon Digital SLR Cameras
by SIGMA
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Digital Photo Product Details
Manufacturer: SIGMAModel: B0007U00XK
Product features:
- Super wide-angle lens designed for Nikon digital SLR cameras
- Hyper Sonic motor
- 10 to 20 mm Focal length
- 14 Elements in 10 groups
- 3 Special low dispersion and 3 aspherical lens elements
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Digital Cameras Photo Reviews of Sigma 10-20mm f/4-5.6 EX DC HSM Lens for Nikon Digital SLR Cameras
Customer Review: A Must-Have for Wide Angle Enthusiasts with DX Nikon DSLRS
Summary: 5 Stars
I'm a nut for wide-angle photography. I don't mean to get technical, but for those who do not know the sticky details, modern Digital SLRs often have sensors that are quite a bit smaller than the traditional exposure area of film: 24mmx36mm. In the case of Nikon DSLRs (all current models except their $5000 Nikon D3 12.1MP FX Digital SLR Camera (Body Only) professional FX sensor model) use what they call a DX sensor which is 16mmx24mm.
For us old film hounds, this means that a lens of a given focal length will roughly translate to 1.5x when switching from film (of Full frame) to DX. So, your old 20mm wide angle lens will "crop" to about the equivalent of a 35mm lens when put on a DX sensor DSLR.
For those who really like telephoto shots, this is a positive boon. Your 300mm lens will take pictures that have the same angle of view as a 450mm lens, but for those of us wide-angle freaks, this "digital crop factor" takes some of the "punch" out of the bottom end. Many general-use zooms for the DX sensor cameras start around 18mm. This would be ultra-wide on that old film camera, but it takes pictured that look more like what you'd expect from a 28mm lens on a traditional film camera.
Ok, sorry for all the mumbo jumbo, but now on to why this lens is so great...
With its 10mm-20mm focal length, this lens is the 35mm film SLR equivalent of a 15mm to 35mm zoom lens, and 15mm full-frame is about the widest you can go before getting into "fish-eye" territory.
With this Sigma lens at 10mm, you get a very wide angle perspective without crossing over into fish-eye territory. Yes, there is noticeable "barreling", but nothing beyond the range of most modern photo/image editing software's ability to fix. Frankly, I like a little of that in my ultra-wide photos. At the 20mm end, the "barreling" is much less noticeable.
As will all extreme wide angle lenses, if you get right on top of your subject, you'll really amplify the distortion effect, but if you're shooting at 10mm and focusing down to the lenses minimum focus distance (an amazing 10" or so), you're probably already expecting, and even counting on such distortion anyway.
Did I mention that it focuses down to around 10"?
The construction of this lens is solid, and it has a little heft to it. It comes with its own custom lens hood. USE IT. The front element on this lens bulges out a bit (as you can see from the product photos), and aside from helping with lens flare, that extra bit of "guard rail" will help you avoid scratching the thing. I've put a UV filter on the front to help protect the glass, but the distance between that glass and the front lens element makes this "reflection box" that has visibly shown in some of my highly backlit/highly contrasty photos.
The focusing is fast and silent. I really like the fact that this is one of those "internally focusing" lenses which means that the act of focusing does not turn the manual focus rung, and doesn't make the lens change position or size. More importantly, if you want to manually focus, you can just grab the ring and turn because it's not "locked" into place in AF mode like many other lenses.
I've taken some of my best photos with this lens, and for the wide-angle enthusiast with a DX sensor Nikon DSLR, I'd go so far as to say this is a must-have. It's got 2mm wider focal length than the nearest Nikon (with DOES make a visible difference at the low-end), but its incredibly well made and clear from edge to edge (though, it does have that "barrel" distortion... it's still crisp from end to end with little to no vignetting)
Sorry, I probably went on a bit, but as you can tell, I really like this lens. I'd highly recommend that you do your research before you buy it as ultra-wide angles do have some idiosyncrasies, but if you know what to expect (photographically) from them, then this lens is one of the best I've ever played with/owned.
Description of Sigma 10-20mm f/4-5.6 EX DC HSM Lens for Nikon Digital SLR Cameras
Sigma provides the new ultra-wide angle zoom lens from 15mm and this lens is the first of its kind in the world. It can be useful for images of landscapes, large buildings, group photographs or even more. The perspective that changes with the angle-of-view gives picture an extraordinary feeling. Delicate compositions can be adjusted by lens zooming and this is helpful for close-up photography. Provides deep depth of field with its short focal length for amazing photographic expressions. This ultra-wide zoom lens covers a large wide-angle range from 15 mm to 30 mm. With a minimum focusing distance of 30 cm(11.8 inches) throughout the entire zoom range, it is an ideal lens for Digital SLR Cameras. It incorporates hybrid aspherical lens in the front lens group to minimize distortion and astigmatism, and molded glass aspherical lens in the rear lens group to minimize spherical aberration. Minimization of the distortion is a most important issue for zoom lens, but Sigma has succeeded, to provide image quality with minimal distortion by employing aspherical lenses. This lens in corporates an internal focusing system, which eliminates front lens rotation. Since focusing do not change its overall length, this lens is easy to hold and use. Also it is allowing the use of a Petal-type Hood. The lens also 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.Designed exclusively for Nikon digital SLR cameras capable of wide-angle photography, the Sigma 10-20mm f/4-5.6 lens is a powerful tool for landscape photography and other wide-angle applications. The lens offers an ultra-wide angle of view of 94.5 to 56.8 degrees, with three special low dispersion (SLD) glass elements and three aspherical lenses providing optimum image quality throughout the entire zoom range. The lens also incorporates a Hyper Sonic Motor (HSM) to ensure quiet, high-speed autofocusing in addition to full-time manual focusing. Other features include a close focusing distance of 9.4 inches, a non-rotating lens barrel that perfectly suits the petal-shaped lens hood (included), and a one-year warranty.
Specifications
- Focal length: 10-20mm
- Maximum aperture: f/4-5.6
- Lens construction: 14 elements in 10 groups
- Angle of view: 94.5 to 56.8 degrees
- Number of diaphragm blades: 6
- Minimum aperture: f/22
- Minimum focusing distance: 9.4 inches
- Maximum magnification: 1:6.7
- Mount: Nikon
- Filter size: 77mm
- Filter size: Petal-type hood
- Dimensions: 3.3 inches in diameter and 3.4 inches long
- Weight: 17.5 ounces
- Warranty: 1 year
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