ND Transmission
Transmission is the fraction of incident light remaining after an ideal filter.
ND Transmission
Exposure · 1 input
How to use this calculator
- Enter filter strength in stops.
- Select Calculate and keep the output unit with the answer.
Before you use the answer
Keep capture settings, physical dimensions and delivery requirements in separate columns of the job notes. A mathematically equivalent setting may change motion blur, depth of field or noise. Check an actual frame before committing an entire session to a numerical estimate.
Spectral transmission may not be perfectly neutral in a real filter.
Does it save my inputs?
No calculation history is stored by this website. The calculator works locally in your browser. See the privacy policy for hosting and contact details.
Why might a result be approximate?
Measurement uncertainty, ideal-model assumptions and floating-point rounding can all matter. Displaying more digits does not improve the original measurement.
Related calculations
Equivalent Shutter for ISO
For equivalent rendered brightness at a fixed aperture, shutter time scales inversely with ISO.
Open calculator ↗Equivalent Shutter for Aperture
Changing aperture requires a squared shutter-time correction to preserve optical exposure.
Open calculator ↗Exposure Compensation Multiplier
A stop-based correction becomes a multiplicative exposure factor.
Open calculator ↗