Photography is evolving -- Dramatically! I am talking about advances with smartphones, mirrorless cameras, and AI technology -- this is an exciting time to be a photographer. But there must be a better way than watt-seconds to compare lights.
Mystified by talk of "guide number" and "flash power"? Gerald Undone made this helpful 10-minute video that explains everything you need to know about the light from strobes and speedlights, from common misconceptions to practical formulas that will help you light your shots.
This is probably a "duh" fact for many of you, but one that some of you have perhaps never heard or realized before: Did you know that the flashes in the Canon Speedlite lineup are named after their maximum guide numbers? To figure out the power of your Speedlite, just take the model name and hack off the zero at the end to get the GN (e.g. 430EX has GN 43, 580EX has GN 58).