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Exposure & Metering

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Exposure & Metering

Reciprocal Rule

A handholding guideline stating that the slowest safe shutter speed is roughly one over the focal length in use.

t ≤ 1 / (focal length × crop factor) seconds
Exposure & Metering

Reciprocity Law

The principle that exposure depends only on the product of light intensity and time, so halving one and doubling the other leaves the…

H = E × t lux-seconds (lx·s)
Exposure & Metering

Reflected-light Metering

Measuring the light bouncing off a subject toward the camera, which is what every built-in camera meter does.

EV
Exposure & Metering

RGB Histogram

Three separate histograms, one per colour channel, revealing clipping that a combined luminance histogram would hide.