The Sigma EF-630 is a high-powered external flash unit for Nikon i-TTL cameras with a guide number of 63 at ISO 100/200mm and built-in wide-angle diffuser. It supports i-TTL auto exposure, HSS high-speed sync, and multi-flash modes for Nikon DSLR systems. The EF-630 is Sigma's flagship external flash.
Product released: February 1, 2016
Latest firmware version
Version 1.03, released August 5, 2021
What's new in version 1.03
It has changed the term of flash function to “Transmitter (TX) / Receiver (RX) Receive & Flash (R & FL)”.It adds compatibility with the Nikon Z 7II, D6, and D780.