I’ve been reading “Speedliter’s Handbook” from Syl Arena. Reading is nothing, the most important part is actually trying and experimenting. Here are my discoveries from some of these experiments.

Secret #1 of when using the flash

The shutter speed controls the ambient light when using the flash. The Canon 7D has a sync speed of up to 1/250th of a second with the flash. At short range, the flash is the main source of light. The flash, at full power, has a speed of 1/1000 for the 580ExII and 1/500 for the 430ExII. The light from the flash will not be affected (almost) by a camera Tv change of 1/250 to a 1/60 of a second. But the ambient light will be significantly affected.

Secret #2 of when using the flash

The aperture controls the flash exposure. A f/4 will give a very different flash exposure than a f/8.

Secret #3 of when using the flash

  • Indoors: I get more flash success with the center-weighted average metering.
  • Outdoors: I get more flash success with the evaluative metering.