ND Stops from Factor
A filter factor describes how much longer exposure must be; its logarithm gives stops.
ND Stops from Factor
Exposure · 1 input
How to use this calculator
- Enter filter factor in ×.
- 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.
An ND64 factor is distinct from an optical-density notation such as ND 1.8.
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.
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ND Optical Density to Stops
Optical density is based on powers of ten, while exposure stops are based on powers of two.
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Transmission is the fraction of incident light remaining after an ideal filter.
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For equivalent rendered brightness at a fixed aperture, shutter time scales inversely with ISO.
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