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(More customer reviews)I am going to give my opinion comparing the Sigma 8 - 16mm to the Sigma 10 - 20mm lens and not to other manufactures WA lenes.
I take around 200,000 pictures a year with the Sigma 10 - 20mm lens. The lens has held up well, feels solid and in my opinion works well with little chromatic aberrations. My only real issue with the 10 - 20 was when taking photos of dark home interiors (which is what I do) and there is a very bright window in the image then sometimes a blue flare appears just off center in the image. This can be reduced by, say 90% in Photoshop. It does not happen every time but when it does even moving to a slightly different shooting position often does not eliminate the problem. The blue flare seems to be not the same problem one might expect to see outdoors shooting in bright sunlight where flare spots can run diagonally through the picture, but then maybe it is the same type of flare. Also by even adding a "thin" filter it can cause some vignetting. The filter issue is forgivable on such a wide angle lens. One last point, there is some slight curvature noticable on verticals close to the sides of the frame.
So to the Sigma 8 - 16mm. I think it's very well made and feels good and solid right out of the box. I was thinking "20% wider" but forgot also 20% taller in image coverage. It is noticable different in angle of view from the 10 - 20mm. Because of the bulbus front element forget about ever adding a filter. Some WA lenes (fisheyes) allow fitting a filter in the rear of the lens. Forgive me but I have not looked to see if this lens allows that. The front of the lens has a fixed petal lens shade that allows the lens cap to slide/push over it and creating a nice tight fit. The lens cap is in two parts for reasons someone else will have to explain.
The lens has a maximium f4.5 - f5.6 aperture, a little slow but of no importance for most users of a lens this wide and for 99% of the uses it will be put to.
I have taken about 2,000 pictures with my 8 - 16mm and think it is probably slightly better in all aspects than the 10 - 20mm lens, but read the guys who put this lens through lab tests, my tests are in the field and based on what my eyes can see rather than what instruments can measure.
It is a harder lens to use than the Sigma 10 - 20mm. Tilting just slightly will cause verticuls to tilt (thank you Photoshop). I have noticed the blue flare less with this lens than the 10 - 20mm. I think it may be there but spread over a bigger area and less strong and maybe less common. Some flare is to be expected with all super wides. Curviture at the frame edges seems about the same as the 10 - 20mm - which I consider good - again for a super wide.
So which is the better choice. That is a difficult question to answer - it depends. The 8 - 16mm is about $200 more - but is noticable wider. It you need to squeese every inch from a picture then the 8 - 16 is your choice. If price is a concern or landscape is your interest I am sure the 10 - 20 would suffice. However if money is no object then get the 8 - 16mm and then go out and learn to use it. Believe me there is a learning process.
Click Here to see more reviews about: Sigma 8-16mm f/4.5-5.6 DC HSM FLD AF Ultra Wide Zoom Lens for APS-C sized Pentax Digital DSLR Camera
The Sigma 8-16mm F4.5-5.6 DC HSM is the only one of its kind. This is the first ultra wide zoom lens with a minimum focal length of 8mm, designed specifically for APS-C size image sensors. It has an equivalent angle of view of a 12-24mm lens when used on digital camera with an APS-C size image sensor.Sigma's new FLD glass elements, which have the performance equal to fluorite glass, compensate for color aberration. One hybrid aspherical lens and two glass mold elements give excellent correction for distortion and astigmatism.An inner focusing system produces high definition images throughout the entire zoom range and the Super Multi-Layer Coating reduces flare and ghosting while superior peripheral brightness ensures high contrast images throughout the entire zoom range.HSM ensures quiet and high speed AF as well as full-time manual focus capability. It has a minimum focusing distance of 9.4 inches throughout the entire zoom range which allows photographers to emphasize the subject by creating exaggerated perspectives. This lens has a compact construction with an overall length of 4.2 inches and a maximum diameter of 2.9 inches and is perfect for shooting landscape photography, architecture, building interiors, photojournalism, wedding photography, group pictures and more. 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. * AF wi
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