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Results for “Aperture”

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Effective Aperture Exposure & Metering f-stops (EV) The working f-number of a lens once it is focused close, which is always darker than the marked aperture because the lens is extended away from the sensor. N_eff = N × (1 + m) Entrance Pupil Optics, Lenses & Filters mm The apparent size and position of the aperture as seen from in front of the lens, which is what the f-number is calculated from. D = f / N Equivalent Exposure Exposure & Metering stops (EV) Any different combination of aperture, shutter speed and ISO that yields identical image brightness. N₁²/t₁ = N₂²/t₂ Exit Pupil Optics, Lenses & Filters mm The apparent size and position of the aperture as seen from behind the lens, which governs how light strikes the sensor. Exposure Exposure & Metering lux-seconds (lx·s) The total amount of light that reaches the sensor or film, set by the combination of aperture, shutter speed and the scene's brightness. H = E × t Exposure Triangle Exposure & Metering stops The teaching model that links aperture, shutter speed and ISO as three interdependent controls, where changing one requires compensating with another. Aperture ↔ Shutter ↔ ISO Exposure Value (EV) Exposure & Metering EV A single number describing every combination of aperture and shutter speed that produces the same exposure. EV = log₂(N² / t) 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.