The EF-X500 is a hot-shoe mount flash with the maximum guide number of approx. 50 (ISO100·m) / 164 (ISO100·ft) and supports the FP mode (high-speed flash sync) and multi-flash lighting. Shoe Mount Flash EF-X20 is a compact and stylish hot-shoe flash, powered with two AAA batteries, with an easy-to-use dial to control output. EF-42 hasTilt angle: 90°. Swivel angle: 180° (Left) and 120° (Right). EF-20 has Tilt angle: 90°.