Through-the-lens metering

Through-The-Lens Metering Meter built into the camera determines exposure for the scene by reading light that passes through the lens during picture-taking.
Time Exposure A comparatively long exposure made in seconds or minutes.

Through-The-Lens Metering
A meter built into the camera that determines exposure by reading light passing through the lens.
Time Exposure
A comparatively long exposure made in seconds or minutes. See also Shutter Speed, Tripod.

Through-the-lens metering compensates for the filter. With external meters see Exposure below.
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Use grads just as you would with an SLR.

E-TTL (Evalulative-Through-The-Lens Metering) is a flash metering systems designed by Canon, in which the flash unit fires a pre-flash burst prior to the main flash firing in order to get a more accurate metering reading for a more correct exposure.

Most underwater photographers today learn to shoot with TTL (through-the-lens metering). Unfortunately, most also do so without understanding its benefits and drawbacks. Under many circumstances, it works quite well. But TTL is far from foolproof.

TTL Refers to through-the-lens metering, in which light levels of a scene are measured by the camera's meter through the lens. Most common in SLR cameras. The term is also often used to indicate a camera's built-in auto flash exposure system.

They optimize flash exposures with their through-the-lens metering "on the fly". But even for those cameras the guide number helps to understand the limited distance on which a flash is effective, see formulas ...

Refers to both exposure metering of the light passing through the lens (Through-the-lens metering, and TTL flash metering) and viewing a scene through the same lens that allows light to reach the film (Through-the-lens focusing).

TTL: Through-the-lens metering. It uses cells inside the camera to measure light that has passed through the camera lens.
Tungsten film: Color film balanced to light sources with color temperature of 3200K.

The next technological advance came in 1960, when the German Mec 16 SB subminiature became the first camera to place the light meter behind the lens for more accurate metering. However, through-the-lens metering ultimately became a feature more ...

Regular through-the-lens metering will still work on all lenses. You need to find one with the right thread diameter for your lens, but if neither Nikon nor Canon has one to fit, you can always use a step-up ring.

Viewing a scene to be photographed through the same lens that admits light to the film. Through-the-lens viewing, as in a single-lens-reflex (SLR) camera, while focusing and composing a picture, eliminates parallax.

Through-The-Lens ...

cameras, for all their blessings, are subject to rapid, distracting brightness changes. Alternative: use it to set exposure, lock it out and make manual Stop changes, or allow the image temporarily to be dark or light. See: Through-the-Lens Metering.

See also: Meter, Photograph, Stand, Through-the-lens, Lens