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Term - Twilight factor |
| Twilight factor | SWPP Photographic Glossary | Monday 24th January 2022 |
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Twilight factorAn 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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