Focus & Depth of Field
4 terms
Circle of Confusion
Focus & Depth of Field
mm
The largest blur circle that still reads as a point to the viewer, and the value on which every depth-of-field calculation depends.
c ≈ diagonal / 1500
Continuous-servo Autofocus
Focus & Depth of Field
An autofocus mode, marked AF-C or AI Servo, that keeps adjusting focus for as long as the button is held.
Contrast-detection Autofocus
Focus & Depth of Field
A focusing method that drives the lens back and forth, measuring image contrast, and settles at the point of maximum contrast.
Cross-type AF Point
Focus & Depth of Field
count
A phase-detection point sensitive to detail running in both horizontal and vertical directions.