Sigma EX APO HSM RF is a camera lens suited for a variety of photo shooting needs. It offers a 50 mm - 500 mm f/4.0-6.3 lens focal length. The Sigma camera lens provides users a 35 mm SLR camera format with a zoom lens. With a maximum aperture of f/4-6.3 and a minimum one of f/22, this Sigma camera lens works great for a variety of users. Its autofocus feature is especially great for those looking for consistently solid and clear photos. This Sigma EX APO HSM RF lens can be used with a digital camera and weighs just 65.2 oz. Its 8.5 x 3.7-inch dimension makes the Sigma EX APO HSM RF a great choice for a photo enthusiast or even for professional photographers. The superzoom feature gives users a 50 mm - 500 mm f/4.0-6.3 lens. This feature as well as the 10:1 zoom ratio makes it high performance and versatile for different settings. This 35 mm frame is also tripod compatible and the tripod mount includes Magnesium, which helps to lessen the weight of the lens. Its petal-type hood is great for beginners or professionals alike.