Focus & Depth of Field
60 terms · page 2 of 3
Focus Limiter
A switch that restricts a lens's focusing range, so autofocus does not search through distances the subject cannot occupy.
Focus & Depth of FieldFocus Lock
Holding the current focus distance so that further movement of the camera or subject does not trigger refocusing.
Focus & Depth of FieldFocus Magnification
A function that enlarges part of the live image so focus can be judged at a pixel level.
Focus & Depth of FieldFocus Peaking
A display aid that outlines the highest-contrast edges in the live image, marking what is currently in focus.
Focus & Depth of FieldFocus Priority
A setting that prevents the shutter from firing until the camera confirms focus has been achieved.
Focus & Depth of FieldFocus Shift
A movement of the plane of sharpest focus as a lens is stopped down, caused by residual spherical aberration.
Focus & Depth of FieldFocus Stacking
Combining several frames focused at different distances into one image with depth of field no single exposure could achieve.
Focus & Depth of FieldFocus Throw
The angle through which a focus ring must turn to travel from minimum distance to infinity.
Focus & Depth of FieldFocus-by-wire
A manual focus ring that sends an electronic signal to a motor rather than moving the optics mechanically.
Focus & Depth of FieldFront Focus
A calibration error in which a lens consistently focuses slightly nearer than the intended subject.
Focus & Depth of FieldHybrid Autofocus
A system combining phase detection for speed and direction with contrast detection for final precision.
Focus & Depth of FieldHyperfocal Distance
The focus distance that yields the greatest depth of field, extending from half that distance out to infinity.
Focus & Depth of FieldInfinity Focus
The lens setting at which parallel rays from very distant objects converge on the sensor.
Focus & Depth of FieldLow-light AF Rating
The dimmest light level at which a camera's autofocus is specified to work, quoted in EV at a stated aperture and ISO.
Focus & Depth of FieldMagnification Ratio
The ratio between the size of a subject and the size of its image on the sensor.
Focus & Depth of FieldManual Focus
Focusing by turning the lens ring by hand while judging sharpness visually or by scale.
Focus & Depth of FieldMicroprism Collar
A ring of tiny prisms around a focusing screen's centre that shimmers when the image is out of focus and clears when it is sharp.
Focus & Depth of FieldMinimum Focus Distance
The closest a subject can be to the sensor plane and still be brought into focus.
Focus & Depth of FieldParfocal Lens
A zoom lens that holds focus on the same subject as the focal length is changed.
Focus & Depth of FieldPhase-detection Autofocus
A focusing method that splits incoming light into two views and measures their separation to determine both the amount and direction of…
Focus & Depth of FieldPlane of Focus
The flat surface, parallel to the sensor, at which the subject is rendered with maximum sharpness.
Focus & Depth of FieldPrefocusing
Focusing in advance on the spot where the subject will be, then firing as it arrives.
Focus & Depth of FieldRelease Priority
A setting that fires the shutter whenever the button is pressed, regardless of whether focus has been confirmed.
Focus & Depth of FieldScheimpflug Principle
The rule that when a lens is tilted, the subject plane, lens plane and image plane all intersect along a single common line.