The Canon EF 100-400mm f/4.5-5.6L IS II USM Lens is a versatile telephoto zoom designed for both full frame and crop frame sensor cameras. It has a weather-resistant barrel, making it suitable for wildlife and outdoor sports shooting. A dedicated tension ring allows you to customize zoom torque and the rotation-type zoom ring offers precise adjustment between zoom positions, especially when shooting handheld. Note that while the original 100-400L sports a push/pull zoom design, this version uses a rotation-type zoom ring more common to Canon lenses. The Canon EF 100-400mm f/4.5-5.6L IS II can be paired with both full frame sensor cameras, such as the Canon 5D MK III, and with crop frame sensor cameras, such as the Canon 7D MK II. The focal length equivalent on crop frame sensors is 160-640mm. Please see our notes on limited compatibility with the 2X and 1.4X Canon extenders. "Air Sphere" coatings have been applied to the lens elements to reduce flaring and ghosting and proper light transmission is maintained even in super high contrast/strong lighting conditions. This lens is ideal for outdoor shooting, especially on subjects that are constantly changing distances.