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| {{photonavbar}}
| | #REDIRECT [[Rule of thumb]] |
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| ===Some simple rules===
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| * The Sunny f/16 rule says:
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| :: ''On a sunny day, with <kbd>ISO 100</kbd>, you [[exposure|expose]] at <kbd>1/100s</kbd> with aperture <kbd>f/16</kbd>''
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| * The minimum [[exposure time]] for a lens with [[focal length]] '''N''' mm is 1/'''N''' s. So minimum [[exposure time]] for a 50mm lens is 1/50s
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| * For every doubling of the [[aperture]], you need to quadruple the [[exposure time]] for the same light condition. So if you are exposing <kbd>1/200s</kbd> with <kbd>f/2.8</kbd>, you need <kbd>1/50s</kbd> with <kbd>f/5.6</kbd> to get an image that is similarly bright.
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| * The [[minimum focus distance]] of a regular [[lens]] is around 10x its [[focal length]]. So a 200mm lens focuses starting at 2meters. [[Macro]] lenses are obviously not like that.
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| [[Category:rant]]
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| {{Photodisclaimer}}
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