What is lens aperture?
Lens aperture or the f-number is the ratio of the focal length of the lens to the diameter of the light rays passing through the aperture in the iris diaphragm. Smaller numbers represent bigger openings and allow more light to pass through. F-number settings are adjustable; lenses are marked with their maximum aperture (lowest f-number).
Related Questions
- When I use Tamrons 90mm macro lens as well as some other lenses, the open aperture value displayed on the camera is smaller than designated on the lens. Is my lens defective?
- Other than Di-II Lens Series, all Tamrons AF lenses for Nikon and Pentax are equipped with an aperture control ring, but Di-II lenses do not have the ring. Why is that?
- What Are the Shutter, Aperture and Lens in a Film Camera?
