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6 results for “aperture”

Formulae (6)

G = \eta\left(\dfrac{\pi D}{\lambda}\right)^2

Gain of a dish antenna rises with aperture area and falls with wavelength, scaled by aperture efficiency.

N = \frac{f}{D}

Aperture f-number is focal length divided by aperture diameter.

EV = \log_2\!\left(\frac{N^2}{t}\right)

Combines aperture and shutter speed into one exposure figure.

d = 2.44 \lambda N

Smallest resolvable spot size set by diffraction at aperture N.

GN = N \times d

Relates flash power, aperture and subject distance.

N^2 \propto \frac{ISO}{t}

Aperture, shutter and ISO trade off to keep exposure constant.