Term - Filter factor 2
|Filter factor 2||SWPP and BPPA Photographic Glossary|
Thursday 28th August 2014
Filter factor 2
The number by which an unfiltered exposure reading must be multiplied to give the same effective exposure through the filter. This compensates for the absorption of light by the filter. This process is unnecessary with TTL metering systems as long as the filter is attached during the metering process.
Information provided by: SWPP BPPA
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