The Canon Speedlites first emit a beam to determine the flash-to-subject distance and then momentarily project an illuminated red grid onto the subject to assist the camera's autofocusing system. Most times, this is very quick and convenient, but other times, the beam visually intrudes on the intimate event or surroundings and calls undue attention to the photographer. It's wise in these situations to turn this beam off, and here's where you control its operation. As an alternative, you can always look for spectral highlights in your subject and try to focus on them. If the Speedlite's own AF assist beam firing function is set to Disabled, the flash doesn't emit the beam even if the camera's AF assist beam function is set to On. In this case, the flash overrides the camera.
Was this article helpful?
Compared to film cameras, digital cameras are easy to use, fun and extremely versatile. Every day there’s more features being designed. Whether you have the cheapest model or a high end model, digital cameras can do an endless number of things. Let’s look at how to get the most out of your digital camera.