Resolution improves at f/5.6 (2,298 lines) and peaks at f/8 (2,463 lines), before dropping slightly at f/11 (2,357 lines). That's better than the 1,800 lines we look for in an image. I wasn't able to get any meaningful data out of the lens at 8mm, but was able to analyze a portion of the frame when testing it at 15mm.Īt f/4, the lens notches an average score of 2,217 lines per picture height at 15mm. With a fish-eye that's difficult, as a standard SFRPlus test chart isn't designed to give proper readings with an extremely distorted frame. Normally I run Imatest (Opens in a new window) to check a lens for sharpness. If you love distorted portraits with giant noses filling a good portion of the frame, the 8-15mm will make you happy. The minimum focus distance is 6.2 inches that's measured from the image sensor, which means that you can put the front element extremely close to a subject and lock focus. Turning the notched mark on the zoom ring to either of those will set the lens to its widest field of view where the image covers the entirety of the frame (with no remnants of its circular field of view) on APS-C and APS-H cameras, respectively.Ī manual focus ring sits at the front of the lens, just behind the rear element. There are two additional markings-C and H. The zoom ring sits at the base of the lens and includes markings for 8, 10, 12, 14, and 15mm. The lens has a single control switch, which is a toggle to change between automatic and manual focus. Read Our Canon EF 17-40mm f/4L USM Review If you do want to use a filter, you can add up to three pre-cut gel filters to the rear of the lens. The front element is bulbous, and there's no thread to accommodate lens filter use. It measures 3.7 by 3.1 inches (HD) and weighs in at 1.2 pounds. The 8-15mm f/4L Fisheye USM ($910.95 at Amazon) (Opens in a new window) is sized similarly to other ultra-wide zooms. The cost may be a turnoff for photographers in the market for what is an occasional-use, special effect lens, but there's no arguing with the quality of the product. It also includes autofocus, compatibility with full-frame cameras, and the build quality and weather-sealing that you expect from an L-series lens. But there aren't a lot of zoom designs (Pentax and Tokina both sell a 10-17mm fish-eye for APS-C SLRs), and none other that switch from a fully circular field of view to a more traditional fish-eye look as the Canon EF 8-15mm f/4L Fisheye USM ($1,249) can. There are plenty of inexpensive fish-eye lenses out there, including the Lensbaby Circular Fisheye ($357.16 at Amazon) (Opens in a new window) and the Samyang 12mm F2.8 ED AS NC Fish-eye ($355.52 at Amazon) (Opens in a new window).
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