Results for “Aperture”
4 terms
T-stop
Exposure & Metering
T-stops
A measured aperture value that accounts for the light a lens actually transmits, rather than the geometric ratio an f-number implies.
T = N / √(transmittance)
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
Teleconverter
Optics, Lenses & Filters
× magnification
A supplementary optic mounted between lens and body that multiplies focal length at the cost of light and, usually, sharpness.
N_new = N × magnification
Tilt-shift Lens
Optics, Lenses & Filters
degrees, mm
A lens that can be tilted or shifted relative to the sensor, controlling the plane of focus and correcting converging verticals.
Scheimpflug: subject, lens and film planes meet on a line