How we test
We combine real-world shots with rigorous lab tests
We test all features for each flashgun. These typically include flash exposure compensation and manual power settings, motorized zoom heads and advanced flash modes like high-speed sync, rear curtain and, in some cases, strobe flash. To test power output, we used a Sekonic flash meter placed one metre from each flashgun. We check the complete range of manual power settings, in one-stop increments. Based on a sensitivity of ISO100, the figures correlate directly with the Gn (Guide number).