The Sigma EF-630 is a high-powered external flash unit for Sigma SA mount cameras with a guide number of 63 at ISO 100/200mm and wide-angle diffuser. It supports TTL auto exposure, HSS high-speed sync, and multi-flash modes for Sigma DSLR systems. The EF-630 is Sigma's flagship external flash.
Product released: February 1, 2016
Latest firmware version
Version 1.05, released August 5, 2021
What's new in version 1.05
It has changed the term of flash function to “Transmitter (TX) / Receiver (RX) Receive & Flash (R & FL)”.