Compatible with both PENTAX DSLRs and RICOH GR Series digital cameras, this compact, portable flash has a maximum guide number of 18 at ISO 100/m. Designed with outdoor shooting in mind, it features 18 seals in crucial parts of the body, including the hotshoe, making it a highly dependable dustproof, weather-resistant accessory. When paired with a dustproof, weather-resistant DSLR camera body and lens, it assures solid performance, even in harsh outdoor conditions such as rain, mist and dust. The AF180FG features bounce-flash functionality. The flash head that can be adjusted vertically to 10 different angles, up to 135° (-10, 0, 30, 45, 60, 75, 90, 105, 120 and 135 degrees) for bounce flash operation. By bouncing the flash discharge off the ceiling or wall during indoor shooting, the user can soften the subject's shadow to create more natural, true-to-life portraiture. It features a simplified operating system that lets the user start flash photography instantly by turning the discharge mode dial, which also functions as the ON/OFF switch. In addition to the OFF position, this dial provides a choice of four discharge modes: P-TTL auto flash with leading-curtain synchronization and P-TTL auto flash with trailing-curtain synchronization, in both of which the flash's preliminary emission is detected by the camera's light sensor to accurately control the main discharge level for proper exposure; and manual flash with full discharge and manual flash with 1/4-level discharge. The AF180FG also incorporates a built-in wide-angle panel that slides out to cover a 20mm angle of view (in 35mm format).