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Twilight factorSWPP Photographic Glossary

Friday 27th April 2018  




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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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10/02/2017 10:29:13