This is the GGS Swivi Professional Viewfinder Loupe S1 for Video on DSLR Camera [JU1200] The Swivi is a series of professional optical LCD viewfinder designed for video shooting of DSLR camera. The Swivi viewfinder provides an extremely clear, magnified view. Essentially it is ideal when shooting video in daylight conditions. It has 2 different modes: Magnification and Standard. Magnification mode provides a 3x magnifying view on LCD. Simply flip up the eyepiece to use as a sunshade hood. The rubber eyecup can be moved to a different direction for different eye. Viewfinder attaches to the camera by using included adapter frame. The GGS Swivi Professional Viewfinder Loupe S1 for Video on DSLR Camera is designed for the Canon 5D MkII, 7D and the Nikon D90 and D7000 Features: 3×Optical Magnification Sunshade Hood Adjustable dioptre Rotatable Eye-Cup can fit different eye Specification: Lens: 3 piece/group Magnification: 3× Dioptre: ?3 Transmittance: greater than 90% Lens Aperture: 40mm Support: 3? 4:3 Mode: Magnification/ Sunshade ...Contact us if you need more help.