Underwater Photography Calculator

Camera housing depth rating and strobe positioning.

Depth (m)

Strobe GN (air)

Aperture (f/)

Water visibility (m)

Subject distance (m)

Water type (0=clear, 1=temp, 2=murky)

Tab to move between fields

Ambient light loss (stops)

1.4

Max flash range (m)

1.9

Red light loss (stops)6.7

Orange light loss (stops)3.3

Strobe GN (underwater)10.7

Flash power needed (%)62

Apparent distance (m)1.13

Backscatter risk (1-3)2

Yellow Loss Stops1.25

Flash AdequateYes

Recommended Max Distance M3

How to Use This Calculator

Enter your diving depth in feet and water clarity (visibility) in feet.
Select the water type (tropical saltwater, temperate, freshwater).
Set your strobe or video light guide number and target subject distance.
Review the Color Correction Filter recommended for the depth and water type.
Use the Strobe Power Setting output to get accurate exposure without backscatter.

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