Call a Sherpa: Sigma's 200-500mm lens
Squeezing all three into the same lens is tough, but Tokyo-based lens maker Sigma has done just that with a model with a 200-500mm zoom range. It's got a wide aperture, F/2.8, for taking higher-speed shots.
But there's a catch: the lens weighs 40 kilograms, or about 88 pounds.
The company is showing off a prototype here at the … Read more