Measuring Light

Measuring Light

Lecture notes on measuring light

Academic year: 2022/2023

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Measuring Light - Inside the camera there is a light metering cell which measures the reflective light that is coming into the camera, and indicates the light coming through the camera on a light meter scale. - The light meter scale will show when there is enough light, not enough light, or too much light - working with the exposure triangle. - The meter in the camera reads reflective light properly The Moment of Exposure - The inside of a camera is always completely dark until the shutter button is pressed. - Pressing the shutter button causes the mirror to flip up and the shutter to open up ; the light goes through the aperture of the lens and hits the sensor, at which point the shutter closes and the mirror flips back down. (all within a fraction of a second) - Correct exposure ensures that highlights are bright but not “blown out” / shadows are dark but not “blocked out”, and that there are a range of midtones. - Within correct exposure, the right amount of light enters the camera and the correct pair of aperture and shutter speed have been selected.

If a picture is overexposed, the light meter will indicate this by pointing towards the positive direction. Overall the photo will appear too light with “blown out” highlights and no shadows. Overexposure means that too much light is entering the camera.
Overexposure can be corrected by making the aperture smaller or the shutter speed faster in order to leave in less light.
If a picture is underexposed, the light meter will indicate this by pointing towards the negative direction. Underexposed photos are overall too dark with “blocked up” shadows and no highlights.
In overexposed shots, there is not enough light entering the camera. To correct the exposure of an overexposed photo, the aperture can be made larger or the shutter speed slower to leave in more light. Light Meter
A light meter simply measures the light and is not intelligent. Light meters are designed to read reflected light, and thus - can collect a false reading if pointed directly at a light source such as a window, the sun, or a lamp.
Bracketing is to underexpose or overexpose a photo on purpose (shooting one image at the camera’s normal exposure, then shooting one at a stop over that exposure and one at a stop under the suggested exposure).

Measuring Light

- Inside the camera there is a light metering cell which measures the reflective light that

is coming into the camera, and indicates the light coming through the camera on a light

meter scale.

- The light meter scale will show when there is enough light, not enough light, or too much

light - working with the exposure triangle.

- The meter in the camera reads reflective light properly

The Moment of Exposure

- The inside of a camera is

always completely dark

until the shutter button is

pressed.

-Pressing the shutter

button causes the mirror

to flip up and the shutter to open up ; the light goes through the aperture of the lens and

hits the sensor, at which point the shutter closes and the mirror flips back down. (all

within a fraction of a second)

-Correct exposure ensures that highlights are bright

but not “blown out” / shadows are dark but not

“blocked out”, and that there are a range of midtones.

- Within correct exposure, the right amount of light

enters the camera and the correct pair of aperture and

shutter speed have been selected.

Intro to Photo : Digital (ART376)

Millersville University of Pennsylvania

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Measuring Light

Course: Intro to Photo : Digital (ART376)

University: Millersville University of Pennsylvania

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