Opteka TTL Auto-Focus Dedicated Flash Speedlite (IF-500) for Sony a7r, a7s, a7, a6300, a6000, a5100, a5000, a3000, NEX-7 and NEX-6 E-Mount Digital Mirrorless Cameras Compatible with Sony a7r, a7s, a7, a6300, a6000, a5100, a5000, a3000, NEX-7 and NEX-6 digital cameras featuring TTL support NOT compatible with Sony NEX-3 and NEX-5 Guide number at ISO 100 of 130' at 105mm TTL, RPT and Full manual control option from 1/1 to 1/128 power Exposure compensation from -3 to +3 EV