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Focus & Depth of Field

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Focus & Depth of Field

Selective Focus

The deliberate use of a narrow zone of sharpness to direct attention to one element and suppress everything else.

Focus & Depth of Field

Shallow Depth of Field

A narrow zone of sharpness that isolates the subject against a strongly blurred foreground and background.

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Focus & Depth of Field

Single-point AF

An area mode in which the camera uses one selected focus point and ignores everything else in the frame.

Focus & Depth of Field

Single-servo Autofocus

An autofocus mode, marked AF-S or One Shot, that focuses once and then locks while the shutter button is held halfway.

Focus & Depth of Field

Split-image Screen

A focusing screen with a central circle divided in two, whose halves align only when the subject is in focus.

Focus & Depth of Field

Subject Tracking

A mode in which the camera identifies a chosen subject and follows it around the frame, moving the active focus area to match.

Focus & Depth of Field

Tracking Sensitivity

A setting that controls how quickly continuous autofocus abandons its current subject when something else enters the frame.

scale (−3 to +3 typically)
Focus & Depth of Field

Varifocal Lens

A zoom lens that does not hold focus when the focal length changes, requiring refocusing after every zoom.

Focus & Depth of Field

Wide-area AF

An area mode in which the camera considers the entire frame when choosing what to focus on.

Focus & Depth of Field

Working Distance

The clear space between the front of the lens and the subject at closest focus.

Working distance = MFD − lens length − flange depth mm
Focus & Depth of Field

Zone AF

An area mode in which the camera selects automatically from a defined cluster of points rather than the whole frame.

Focus & Depth of Field

Zone Focusing

Presetting a lens to a distance and aperture whose depth of field covers the range the subject will occupy, then shooting without focusing…

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