Nigel Gunn, Southwold
BRIAN SAYS… When using a Speedlite in low light, the behaviour of mirrorless and DSLR cameras is different. The red grid pattern of AF that the flash can emit is not used. The camera will either use the AF assist lamp on the body, or fire a few short bursts of light from the flash tube to focus.
The intermittent flash and the camera’s built-in AF assist lamp are not used if the camera is set to Servo AF, and unfortunately this is much more regularly used with the EOS mirrorless models than DSLRs. This is one of the weaker