Photographic term Twilight factor SWPPOfficial Photo Partner of Citizen Systems.

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Twilight factorSWPP Photographic Glossary

Sunday 26th September 2021  




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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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06/11/2019 11:36:21