Key Features For GXR Camera System Attaches via Hot Shoe 28mm Equivalent Frame 1:1 Aspect Ratio MarksThe Ricoh GV-2 Mini External Viewfinder is designed for the Ricoh GXR camera system, including the GR Digital Camera. The GV-2 attaches to the camera body via the hot shoe, and when not in use stores nicely in the included case. Highlights of the GV-2 include a 28mm frame and 1:1 aspect ratio marks.Includes 28mm equivalent frame (35mm film equivalent)Mounts to GXR camera systems via hot shoeHas 1:1 aspect ratio marksIncludes storage case