Brightness - Terms of Digital Photography

Brightness - the value characterizing the radiation light source or element of its luminous surface in this direction. Numerically equal to the ratio of intensity source in this direction to the projection area illuminated surface onto a plane perpendicular to this direction. In the SI system is expressed in candelas per square meter.

Terms of Digital Photography. Exposure

Exposure - the amount of coverage, reported a photosensitive layer, and expressed the product of illumination on the illumination time.

Color temperature - Terms of Digital Photography

Color temperature - a quantity characterizing the spectral composition of light. Determined by the temperature blackbody (ie, completely absorbing the rays falling on it) at which its radiation has the same spectral composition and the same distribution of energy over the spectrum as the emission of this source.

Latitude - Terms of Digital Photography

Latitude - the quantity that characterizes the ability of the photosensitive material (a sensor) to reproduce in the same degree of contrast of the differences in the brightness of areas of the optical image of the subject.

Focus - Terms of Digital Photography

Focus - in optics (from the Latin - the hearth, fire) - the point at which after passing through a parallel bundle of rays intersect the optical system ray beam (or its continuation, if the system makes parallel beam in a divergent).

Terms of Digital Photography - TTL

TTL - (Through The Lens) - metering through the lens. The camera evaluates the actual amount of light passing through the optical system.

Terms of Digital Photography - Timer

Timer - A device that allows you to take a picture with a delay. Can be built into the camera, and maybe a remote control.