The Holga Close-Up Ring Flash CFL-500 for Holga Cameras delivers even, nearly shadow-less light for close-up photographs (effective range of the flash is 19.68"/50 cm), using a Holga 120 or 135 camera. It has a built-in slave sensor, test button/ready lamp, exposure table and output level switch and sync cord. A set of four color filters (blue, red, yellow and green) is provided, as well. The flash operates on 2x AA batteries, which are not included. A standard hotshoe-pc adapter is required and is not included. The flash can also be used with Holga 120 and 135 fisheye lenses with the MB-500 mounting bracket.