In photography, filter factor refers to the multiplicative amount of light a filter blocks. == Converting between filter factors and stops == The table below illustrates the relationship between filter factor, the amount of light that is allowed through the filter, and the number of stops this corresponds to.
In photography, filter factor refers to the multiplicative amount of light a filter blocks. == Converting between filter factors and stops == The table below illustrates the relationship between filter factor, the amount of light that is allowed through the filter, and the number of stops this corresponds to.
Source: Wikipedia "Filter factor" · CC BY-SA 4.0
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