Opteka High Definition 500mm / 1000mm f/8 Preset Telephoto Lens for Sony Alpha & Minolta Maxxum Digital SLR Cameras

f/8, High-index / low-dispersion optical glass, Fully multi-coated, every element, Anti-reflection coatingDesigned to maximize day and night shots by providing maximum light and image transmission with minimum distortion, Fantastic for all types of photographic situationsGreat for the wildlife or nature photographer who wants to be hidden while taking photos of the subject500mm Preset Lens, Carrying bag, and lens caps included!May be combined with the Opteka 2X Multiplier for 1000mm Zoom

Source: Digital Camera and Video Store...