Stopping down

The technique of increasing the f-stop number in order to reduce the amount of light entering the iris of a lens.

In photography, stopping down refers to increasing the numerical f-stop number (for example, going from f/2 to f/4), which decreases the size (diameter) of the aperture of a lens, resulting in reducing the amount of light entering the iris of a lens.

Reducing the aperture size increases the depth of field of the image. In the case of film cameras, this allows less light to reach the film plane – to achieve the same exposure after stopping down, it is necessary to compensate for the reduced light by either increasing the exposure time or using a photographic film with a higher speed. In the case of digital cameras, stopping down the aperture allows less light to reach the image sensor – to achieve the same exposure, it is necessary to compensate for the reduced light by either increasing the exposure time or increasing the signal gain of the sensor by increasing the camera's ISO setting. Alternatively, more light can be added to the scene by increasing the amount of light illuminating the scene, such as by using or increasing the strength of electronic flash or other light sources.

As a lens is stopped down from its maximum (widest) aperture, most lens aberrations (spherical aberration, coma, and astigmatism) are decreased, but lens diffraction increases. The effect is that for most lenses, the balance between the decreasing aberrations and the increasing diffraction effects of stopping down the lens means that lenses have an optimum aperture for best results, often about three stops closed down from maximum aperture, so for a lens with a maximum aperture of ƒ/2.8, ƒ/8 would be the optimum aperture.

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Stopping down
also known as
  • Stop down
resources
  • Exposure Stops in Photography – A Beginner’s Guide on photographylife.com
  • You Can Increase Sharpness a Lot by Stopping Down Just a Little on petapixel.com
  • Shooting Portraits Wide Open vs Stopping Down Part 2 on youtube.com
  • Photography Tips : Stopping Down in Photography on youtube.com
  • Shooting Portraits Wide Open vs Stopping Down: The Breakdown with Miguel Quiles on youtube.com
source
Adapted from content published on wikipedia.org
credit
  • Image By KoeppiK - Own work, CC BY-SA 4.0 — from wikimedia.org
Last modified on June 10, 2021, 11:14 pm
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