PRODUCT DESCRIPTION IN THE BOX The Raynox HD-5052PRO 0.5x Wide-Angle Conversion Lens is designed to attach to the built-in lens of compatible 4K/HDV camcorders. It screws onto the front filter threads of these lenses using included adapters. It features 37mm threading on the rear, and it comes with a 37-37mm coupler ring and 37-43mm adapter ring for compatibility with 37mm and 43mm front filter threads, which are the native lenses of most 4K/HDV camcorders. The Raynox HD-5052PRO Wide-angle conversion lens has designed to broaden the angle of view, including 100% more area in the picture, when attached to the lens of 4K/High Definition Camcorders. It's compatible with the whole zoom area and stays in focus*. The HD-5052PRO is made of the high-index optical glass elements with new concept of lens designing using three-group/four-element lens formula. This new concept in designing the lens made it possible to achieve a high definition wide-angle lens of the 600 lines/mm resolution power at center (MTF30%). * Use F37-M37mm ring when mounting on 37mm filter sized camcorder. High-Resolution 600-Line/mm 3-group/4-element High Definition design Compatible with whole zoom area 62mm front filter size Compatible to the latest 4K & HDV Camcorders The adapter rings other than the above listed sizes are also available from us.(Sold separately) Magnification: Nominal 0.5x, Actual 0.50x Diagonal, 0.53x Horizontal Lens construction: 3-group/4-element High Definition design, Coated optical glass elements Image distortion: -13.5%(max.wideangle) Front Filter thread: 62mm Mounting thread: 37mm(RA3737)