(I) A properly exposed photograph is taken at f / 16 and...

Key Concepts

Exposure Stops

Exposure stops are units used to measure changes in exposure, where each stop represents a doubling or halving of the amount of light reaching the sensor. Adjusting exposure by several stops, such as when switching from 1/120 to 1/1000 second shutter speed (which is roughly a 3-stop difference), requires making compensatory adjustments in aperture (or ISO) to preserve a correctly exposed image.

Shutter Speed

Shutter speed is the length of time the camera's shutter remains open to expose the sensor to light. A faster shutter speed, such as 1/1000 second, reduces the amount of light captured compared to a slower speed like 1/120 second. This change necessitates a compensating adjustment in aperture to maintain equivalent exposure.

Aperture (f-number)

Aperture refers to the opening in the lens that controls the amount of light reaching the camera's sensor. It is measured in f-numbers, where a lower number (e.g., f/5.6) represents a wider opening that allows more light, and a higher number (e.g., f/16) represents a smaller opening that lets in less light. Changing the aperture is crucial to balancing exposure when other settings change.

Exposure Triangle

The exposure triangle is the relationship between aperture, shutter speed, and ISO, which determines the brightness of a photograph. Adjustments to one of these elements require compensatory changes in one or both of the others to maintain proper exposure.

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