Search results for “Aperture”

Third Stop Exposure & Metering stops (EV) A one-third-stop increment, the fine adjustment step most digital cameras use for aperture, shutter speed, ISO and exposure compensation. ⅓ stop = ×2^(1/3) ≈ ×1.26

Zone Focusing Focus & Depth of Field m Presetting a lens to a distance and aperture whose depth of field covers the range the subject will occupy, then shooting without focusing at all.

Aspherical Element Optics, Lenses & Filters count A lens element whose surface departs from a simple sphere, correcting aberrations that spherical glass cannot.

Auto ISO Exposure & Metering ISO A camera mode that lets the body select sensitivity automatically within limits the photographer sets, usually with a minimum shutter speed.

Bokeh Optics, Lenses & Filters The aesthetic character of the out-of-focus areas of an image, as distinct from how much of the image is out of focus.

Cat's-eye Bokeh Optics, Lenses & Filters The lens-shaped, off-round rendering of out-of-focus highlights near the frame corners, caused by optical vignetting.

Catadioptric (Mirror) Lens Optics, Lenses & Filters mm A long lens that folds its light path with curved mirrors as well as glass, achieving great focal length in a short, light barrel.

Coma Optics, Lenses & Filters An aberration that renders off-axis points of light as asymmetric comet-shaped smears rather than dots.

Crop Factor Cameras, Formats & Systems × multiplier The ratio between a sensor's diagonal and that of full frame, used to convert focal lengths into their full-frame equivalents. Crop factor = 43.3 mm / sensor diagonal

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

Equivalent Focal Length Cameras, Formats & Systems mm The full-frame focal length that would give the same angle of view as a given lens on a smaller format. f_equiv = f × crop factor

EXIF Files, Metadata & Workflow The standard block of technical metadata a camera writes into a file, recording settings and equipment.

Exposure Compensation Exposure & Metering stops (EV) A deliberate offset applied to the camera's metered reading, expressed in stops, to make an image brighter or darker than the meter suggests. Setting = Metered EV − Compensation

Eye AF Focus & Depth of Field A refinement of face detection that locates and focuses on the eye itself, and usually lets the photographer choose which one.

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.

Group f/64 Genres, Movements & Theory A short-lived association of West Coast American photographers formed in 1932 to advocate sharp, unmanipulated photography.

Holy Grail Transition Motion, Video & Creative Techniques stops A time-lapse that runs across a large change in light, such as day into night, requiring exposure to change during the sequence.

Lens Adapter Cameras, Formats & Systems mm A ring or unit that lets a lens designed for one mount be fitted to a body with a different one.

Lens Correction Profile Post-Processing & Retouching A stored description of a lens's distortion, vignetting and chromatic aberration, applied automatically during processing.

Lens Flare Optics, Lenses & Filters Stray light scattered inside a lens by a bright source, appearing as streaks, polygons or a general wash across the image.

Results for “Aperture”