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The Sunny 16 Rule

A simple rule of thumb for taking photos in daylight without a light meter

The Sunny 16 Rule is easy to remember - if you’re taking a photo of a subject under bright daylight set your camera’s aperture to f/16 and shutter speed to the closest reciprocal of the film speed.

f16 + 1/≈ISO

For example, on a sunny day with the aperture set to f/16, using ASA 100 film, you set the camera to the closest available shutter speed; ideally 1/100 but more likely on a rangefinder to be 1/125.

Just in case the sun isn’t shining and you still want to take a well exposed photo without a light meter, here are some variations, still keeping the shutter speed the same as the speed of the film.

f/16 for Sunny
f/11 for Slightly Overcast
f/8 for Overcast
f/5.6 for Heavy Overcast
f/4 for Sunset Sky

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About Ilott Vintage

A valuable reference for anyone wanting to learn more about rangefinder cameras, manual film photography, or both, this website is intended to serve not only as a resource to discover some amazing objects but also as a place to learn more about them, to understand exactly what they are capable of, and why. Read More

See Also
  • Minolta Repo-S
  • Fujica 35SE Beauty meets Beast
  • Minoltina AL-s Nobody loves a fat camera
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    Wednesday 8th February 2023