Use Strobe Power and the Flash-to-Subject Distance


show more Using strobe power and the flash-to-subject distance provides you with in-depth training on Photography. Taught by Brent Winebrenner as part of the Lighting for Photographers: Flash Exposure Fundamentals show less
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Using strobe power and the flash-to-subject distance

The amount of illumination falling on a subject is a function of two variables, the power of the flash, and the flash to subject distance. We can control the amount of light falling on the subject by adjusting either one of these variables. We're going to talk about the power output of small strobes in great detail when we discuss guide numbers and power ratios, but first let's tackle the Inverse Square Law and learn how to predict the effect that changing our flash to distance has on illumination. At first this may seem like a lot of math, but stick with me and you'll see how this pays off once you understand how it works.

Intuitively, we know that the closer we move the light to our subject, the more illuminated the subject becomes. Unfortunately, this is not a linear progression. On the face of it, it seems that if you cut the flash to subject distance in half, you would double the amount of light falling on the subject. Unfortunately, this is not true. Instead the change in illumina...

Using strobe power and the flash-to-subject distance
Video duration: 4m 43s 1h 27m Advanced

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Using strobe power and the flash-to-subject distance provides you with in-depth training on Photography. Taught by Brent Winebrenner as part of the Lighting for Photographers: Flash Exposure Fundamentals

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Photography
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