Get information and user reviews for this lens at Amazon: Sigma 50-500mm f/4-6.3 EX DG HSM APO RF Telephoto Zoom Lens for Sigma SLR Cameras
Digital Picture
Any 10x SLR zoom lens (50mm x10 = 500mm) is going to be attractive, but one that ends with a 500mm focal length is going to get an especially high amount of attention. … AF is accomplished via Sigma’s HSM (Hypersonic Motor). It is quiet, does not extend (rear-focusing), fast and has proven accurate to me even in AI Servo mode shooting sports. Colors appear accurate, but contrast is not as good as some of the other options – none of which have this focal length range of course. Vignetting is well controlled through the middle focal length ranges, but will be noticeable at 50mm and from 300-500mm with a wide open aperture. CA (Chromatic Aberration) is well controlled with some showing in corners at 50mm and from 400-500mm. The Sigma 50-500mm f/4-6.3 EX DG HSM Lens shows a little barrel distortion at 50mm and moderate pincushion distortion over most of the rest of the focal length range. … The Sigma 50-500mm f/4-6.3 EX DG HSM Lens is not cheap, but it is a decent value. And nothing else gives you 50-500mm in one lens. READ FULL REVIEW