02
TECHNIQUES IN DETAIL
If you need to quickly determine flash power, a guide number, the degree of light loss for high-speed sync (HSS) flash, or the right neutral density (ND) or color filter to use, this chapter gives you all the background information you need to make the right decision. You can also read all about how to use a handheld exposure meter, how the inverse square law works, and what “Through the Lens” (TTL) flash is all about.
How to Calculate Flash Output and Guide Numbers
Because the flash duration—the length of time that the flash fires—usually “fits” within the exposure time (the shutter speed), studio flash output is expressed ...
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