What is sigma 17 70?

Sigma 17-70 is a zoom lens that is designed for use with crop-sensor digital SLR cameras. It has a focal length range of 17-70mm, which provides a wide range of focal lengths that can be used for a variety of photography styles. The lens has a maximum aperture of f/2.8, which is ideal for low light photography. It also features a minimum focusing distance of 8.7 inches, making it ideal for capturing close-up shots. The lens is available in different variations, including those that are compatible with Canon, Nikon and Sony cameras. Sigma 17-70 is a versatile and affordable lens that is recommended for those who want a lens that can handle a wide range of photography needs.