Calculating Exposure Increase
The number of f-stops required to correct the exposure with a given filter may also be calculated using the formula:
Filter factor = 2Xwhere the exponent "X" is the number of f-stop increases required.
An example: A deep red filter with a filter factor of 8
8 = 23The normal exposure will be increased by three stops with this filter. As a consequence of this relationship, filter factors should be multiplied together when such filters are stacked, as opposed to stop adjustments, which should be added together.
Read more about this topic: Filter Factor
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