The Panasonic DMW-VF1 External Optical View Finder allows users of the Lumix DMC-LX7, LX5, and LX3 cameras to save battery power and have an option for framing images without using the LCD display, which can be difficult to use under certain lighting conditions. It also features bright-lines for the wide-angle setting of the camera, which is equivalent to a 24mm view on 35mm format. This will help you to avoid vignetting mistakes.
The DMW-VF1 External Optical View Finder attaches to the camera via the hot shoe.