Results for “Aperture”
5 terms
F-number
Exposure & Metering
Dimensionless ratio
The ratio of a lens's focal length to the diameter of its entrance pupil, written f/2.8, f/8 and so on, and the standard way of stating aperture.
N = f / D
Flat Field Correction
Sensors & Digital Capture
Dividing an image by a frame of evenly illuminated field to remove vignetting, dust shadows and photosite sensitivity variation.
Corrected = (light − dark) / (flat − bias)
Focus Confirmation
Focus & Depth of Field
An indicator, usually a dot or the illumination of an AF point, showing that the camera considers focus achieved.
Focus Peaking
Focus & Depth of Field
A display aid that outlines the highest-contrast edges in the live image, marking what is currently in focus.
Freelensing
Motion, Video & Creative Techniques
Detaching a lens from the camera and holding it in front of the mount, tilting it to create selective focus and light leaks.