In photography like in cinematography the F-number is one of the most important parameter to master and to understand.

The F-number is related to the amount of light that passes though the lens, and has a huge impact on the depth of field.

We call is the F-number, because it's dimensionless, and because the effective aperture of the iris is connected to the focal length.

Here are the f-number with an increase of one stop between each value :
F/2 - F/2.8 - F/4 - F/5.6 - F/8 - F/11 - F/16 - F/22

Here is Stanley Kubrick's lens on Barry Lyndon
- Zeiss Planar F/0.7 (Director of Photography : John Alcott)

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This video was made with :
- Blackmagic Pocket Cinema Camera 6K
- Objectif Canon 24-70mm f/2.8
- Sennheiser G4 avec capsule sanken cos
- Micro CSM1

A video made by Romain Lambert
Cine P8

Université Paris 8 Vincennes-Saint Denis
Département Cinéma
Service Technique