Focal length
Focal length
Measure of how strongly an optical system converges or diverges light.
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Readers' pathsAug 2026 – Oct 2026
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F-number
Measure of lens speed.
10%
Focus (optics)
Point at which light rays converge.
9.6%
Optical power
Degree to which an optical system converges or diverges light.
8.7%
Depth of field
Length of area in visual focus.
7.8%
Lens
Optical device which transmits and refracts light.
6.8%
Magnification
Process of enlarging the apparent size of something.
5.3%
135 film
35 mm photographic film format.
5.2%
Thin lens
Lens with a thickness that is negligible.
4.9%
Angle of view (photography)
Angular extent of given scene imaged by camera.
3.9%
Dioptre
Unit of measurement of optical power.
3.3%
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F-number
Measure of lens speed.
32%
Telephoto lens
Type of camera lens with long focal length.
4.5%
Depth of field
Length of area in visual focus.
4.4%
Canon EF lens mount
Standard lens mount on the Canon EOS family.
4.4%
Camera lens
Optical device used with a camera to create images.
4.1%
Aperture
Hole or opening through which light travels.
3.6%
Field of view
Extent of the observable world seen at any given moment.
3.2%
Nikon Z-mount
Digital camera lens mount.
2.8%
Focus (optics)
Point at which light rays converge.
2.7%
Canon RF lens mount
Mirrorless camera lens mount.
2.7%