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Term - Twilight factor


Twilight factorSWPP and BPPA Photographic Glossary

Wednesday 23rd July 2014  




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Twilight factor

An indication of the brightness value of binoculars. It's similar to relative brightness, but you multiply the objective lens with the magnification and then find the square root of the resulting number. A higher number indicates the binoculars will be better for use in low light.



 

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