Compatible with FUJIFILM, Canon, Nikon, Olympus, and Sony cameras, the Lux Junior Retro Camera Flash from Godox is a diminutive 3 x 2.8 x 2" light source with basic features and is small enough to have it regularly mounted on your camera. Called a "retro" flash, the unit has a simple dial that correlates ISO with apertures, power levels, and shooting distances. For example, if you want to shoot at 5' with an ISO of 400, the dial lines up f/4 and 1/8 power. The flash has an Auto Mode, too, that defaults to f/2.8 at ISO 100.