Excerpt: This lens is very sharp in the center and corners at all apertures except 3.5 where the corners seam a little softer.<br />The only real defect I see is somewhat high CA distortion in the corners but since PS and Lightroom 5 have such good tools to take care of this it is no longer a big problem.<br />The extra wide view on the crop sensor cameras is great.
Summary: The edges get a little distorted and since I'm only using a T3i it's not using it's full potential. Really wish I had a better camera body to use the full potential of this lens. The HSM is super sexy compared to my canon lenses. I highly recommend this lens for not just landscape photography but tight rooms and vehicles as well.
Excerpt: Most of my photography and videos are done in conjunction with magazine stories and books, and because most are about outdoors or environmental subjects I often find myself in very tight quarters.<br /> The Sigma 10-20 replaced a 12 mm prime lens and has been great for things like photographing a dove sitting on a nest inside a porch light fixture, three fishermen landing a salmon in the cramped cockpit of a 20-foot boat and bats inside a small cave, where I wanted to...
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Rugged, Strong Construction
Excerpt: The reason I brought this lens is because I need a wide lens for my Pentax K5ii. I shot landscape by this lens and it is great at f8. Talk about the bad side. It is quite heavy, compares to usual Pentax lens. But if you use it with the battery grip? OMG, can't be better. The weight balance just perfect. If you are looking forward to a wide lens foe landscape, I will suggest this one. If you want wider, I will suggest Rokinon 8mm f3.5.
Excerpt: I have been using lenses this wide since the Voigtlander 15mm f4.5 came out for rangefinder cameras in the mid-late 1990's.<br /><br />I have always liked fisheye and rectilinear super and ultra wide angle lenses. Lenses like this are very useful for shooting tight interiors in cars, boats, aircraft, and ships. And these are fantastic for showing a small room in one image.<br /><br />This is also a very dramatic lens to use in video.
Pros: Consistent Output, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Vignetting Well Controlle
Excerpt: I am very happy with this lens. The 3.5 version is a must, the 4.5 is no good in lower light. Forget it and spend a little more to get 3.5. Ive used Nikor 12-24, and this lens performs almost as well. I do architectural photography and the wide 10 mm is great. Have to be cautious in shot selection that you watch for fisheye effect but many times i shoot at 10mm and the images are fine and if not just go up a little.
Pros: Consistent Output, Easily Interchangeable, Strong Construction