Celestron Reducer Lens .7X EdgeHD TM 1400 Design: 5-element optical layout designed specifically for the EdgeHD14" to maintain the flat-field performance of the Edge HD optical design Maintains the same back focus as when used at F/11: Unlike generic reducers the EdgeHD .7x provides generous back focus to accommodate additional accessories and a wide variety of cameras. Also allows use of existing EdgeHD T-adapters and other Celestron imaging accessories One full F-Stop faster than f/11: Reduces the exposure time by one-half to capture the same brightness of object Increase field of view by 43%: Better for capturing wide field images of larger galaxies and nebulae Lanthanum Glass Elements: EdgeHD reducer uses "rare earth" Lanthanum glass elements for clear, high contrast viewing while minimizing chromatic aberration