Results for “Aperture”
6 terms
Depth of Field Preview
Cameras, Formats & Systems
A control that stops the lens down to the working aperture so the actual depth of field can be seen before exposure.
Depth of Field Scale
Focus & Depth of Field
m / ft
Markings on a lens barrel showing the near and far limits of sharpness for each aperture at the set focus distance.
Diffraction
Optics, Lenses & Filters
µm
The spreading of light waves as they pass the edge of an aperture, which softens the image at small f-numbers.
d = 2.44 × λ × N
Diffraction Limit
Optics, Lenses & Filters
f-stops
The aperture beyond which diffraction, rather than lens design or sensor resolution, becomes the factor limiting sharpness.
N_limit ≈ pixel pitch / 1.22λ
Deep Depth of Field
Focus & Depth of Field
m
A wide zone of sharpness in which foreground, subject and background all hold detail.
Depth of Field
Focus & Depth of Field
m
The range of distances in front of and behind the plane of focus that appears acceptably sharp in the final image.
DoF ≈ 2u²Nc / f²