How do we set the f stop setting?

There are different methods of setting the f stop.

Single fixed Aperture

Some cameras simple cameras, like pinhole cameras and cheap plastic disposable cameras only have one fixed aperture setting setting.

Rotating apertures

Some cameras like box cameras have a series of aperture openings from small to larger ( usually 2 or 3) which can be moved across the focal point of the lens.

They might have a series of symbols marked on the lens like a sun, sun and a cloud, cloud etc. Each of these relates to a wider diameter aperture need to allow the appropriate amount of light into the camera.

ND Filters

Mirror lenses have a fixed aperture and use a series of Neutral density filters which drop in to a slot at the back of the lens barrel. While these restrict the light, they are not true apertures and have no effect on depth of field.

Variable Lens apertures

These are true adjustable apertures positioned inside the lens at the focal point, and various ways of setting these have been developed.

How does aperture affect depth of field?
How are the f stop numbers worked out?
What is the difference between each f stop setting?

Want to learn more? - do a workshop or one on one with Lloyd Godman