EF 17-40mm f/4L USM. OR. EF-S 10-22mm f/3.5-4.5 USM. Thanks. Hmmm, you are aware that these are two totally different focal lengths, and that the problems you are talking about with the 17-40 are more pronounced on a FF body (on which it is a UWA lens), but would be cropped on your body. Presumably you already have a lens in the 17/18- 50/55 MTF (resolution) The EF 17-40mm f/4 L showed an excellent performance in the lab. It's quite safe to assume that the peak performance in the center exceeded the resolution limits of the 8 megapixel sensor of the EOS 350D. The borders are very good though stopping down a little helps to lift up the resolution almost to center quality. To learn more about this lens, check out our blog review! Lens Reviews / Canon Lenses i Lab tested. Lens Review; Specifications; Lens Review Specifications Lens Specifications; Name: Canon EF 17-40mm f/4L USM: Image Circle: 35mm: Type: Wide Zoom SLRgear Review August 13, 2014 by Andrew Alexander. A new lens from Canon, the 16-35mm ƒ/4L IS USM is a complement to the existing 16-35mm ƒ/2.8L and 17-40mm ƒ/4L lenses, offering image Product description from Canon. At launch 2003 Canon wrote this regarding Canon EF 17-40mm F4 L USM : "A new and affordable L-series ultra-wide-angle zoom lens that´s ideal for both film and digital SLRs. Superior optics are assured by the use of three Aspherical lens elements, in addition to a Super UD (Ultra-low Dispersion) glass element. Dear all, I am picking out a new kit for a trip to the Galapagos in May and am trying to select what lenses to bring along. I am thinking of purchasing either of these lenses to complement an EF 70-300mm f/4-5.6L IS USM (or should I get a EF 70-200mm f/2.8L IS II USM plus Extender EF 2x III?). Canon 17-40mm. Image quality is a significant step up from the kit lens with good sharpness across the frame. The low light performance is limited due the the constant f/4 aperture but a boost in ISO will still make it useable and it is still better than the f/5.6 kit lens. Most DSLR photographers are looking to upgrade to a full frame camera Bv0I.

canon ef 17 40mm f 4l review