(From Sigma lens literature) The Sigma 150-600mm 5-6.3 DG HSM OS Contemporary was created around the concept of maximum portability meets utmost image quality in a variable aperture hyper ...

It is widely understood that the lens is made by Sigma, modeled after the full-frame Sigma 150-600mm F5-6.3 DG DN OS | Sports for Sony E and L-Mount, which sells for a much lower $1,499 in the US ...

(From Pentax lens literature) The Pentax SMC P-FA 600mm f/4 ED IF telephoto is an ideal lens for professionals and advanced amateurs interested in sport and wildlife photography. It incorporates ...