Review on Ultra Wide Angle Zoom Lens for SLR Cameras - Canon EF 17-40mm f/4L USM by Agung ᠌

It is convenient to use as an additional lens for "general shot", "group photos", . Good results when shooting panoramas, but here, again, you need to take into account possible distortion (ff / crop). Taking into account the fact that in 99% of cases the lens is used for "slow shooting" with f / 8, f / 11 - its aperture, in my opinion, is not critical. Has pros: Build, weight, auto-focus, image quality, even the price - no complaints. Some cons: When used on ff-cameras, with fr less than 28, noticeable distortion appears. On crop cameras - (17 * 1.6) - this is not. In some situations, the lack of a stabilizer becomes problematic - for example, when shooting at a slow shutter speed on a tripod from a bridge over which trucks pass.