[guide] ----- D70 in the Studio: Portrait with Strobes

Started Jun 15, 2005 | Discussions thread
OP tao.design Veteran Member • Posts: 5,632
6 / Metering & Exposure

6 / Metering & Exposure

I use a Sekonic 358 flash meter, which is a light meter that can also calculate exposure using flash units in addition to metering continuous-lighting.

In using strobes, I use the 358 as an incident meter, metering directly from the output of the strobes themselves. This is different than reflective metering, in which exposure is determined on the reflectivity of subject and scene, without regard to light source.

A flash meter like the Sekonic will calculate the appropriate f-stop based on available flash output. Shutter speed is essentially irrelevant given the extremely short duration of strobe output, and 1/500 second is used as a default to the sync-speed of the camera.

The exact shutter speed isn't entirely relevant with strobes, as the actual duration of the flash output is 1/3200 second. For the image presented in the top-thread post, f/16 was used

The hair light was roughly set half power in relation to the keylight, but due to the height and increased distance to the subject, the lighting ratio works out to be closer to 1:3 to the keylight.

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