Panasonic DMW-VF1 External Optical Viewfinder Provides an external optical glass viewfinder alternative to the LCD while using the Panasonic Lumix DMW-LX3 digital camera Mounts into the hot shoe on top of the Panasonic Lumix DMC-LX3 digital camera Conserves battery power by allowing the LCD to be turned off while providing a viewing and compositional aid 46mm thread size It comes with a 24mm frame (35mm camera equivalent)