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During these periods, car headlights, streetlights, and interior lights are on, as they would be at night. [1] This is sometimes referred to as "dusk for night." Shooting this way can be difficult because the desired lighting conditions last only a short time, during which both light levels and color temperatures are constantly changing. [8]
Night photography (also called nighttime photography) is the capturing of images outdoors between dusk and dawn. Night photographers generally have a choice between using artificial lighting and using a long exposure , exposing the shot for seconds, minutes, or hours in order to capture enough light to record an image.
The sensitivity to light, of the medium—the film or the digital camera sensor—is important in landscape photography, especially where great detail is required. In bright daylight, a "slow film" (low- ISO film), or low-ISO digital camera sensor sensitivity setting (typically ISO 100, or perhaps 200), is generally preferred, allowing maximum ...
A dawn simulator can be used as an alarm clock. Light enters through the eyelids triggering the body to begin its wake-up cycle, including the release of cortisol, so that by the time the light is at full brightness, sleepers wake up on their own, without the need for an alarm. Most commercial alarm clocks include a "dusk" mode as well for bedtime.
A photoelectric sensor is a device used to determine the distance, absence, or presence of an object by using a light transmitter, often infrared, and a photoelectric receiver. They are largely used in industrial manufacturing. There are three different useful types: opposed (through-beam), retro-reflective, and proximity-sensing (diffused).
Twilight occurs according to the solar elevation angle θ s, which is the position of the geometric center of the Sun relative to the horizon. There are three established and widely accepted subcategories of twilight: civil twilight (nearest the horizon), nautical twilight, and astronomical twilight (farthest from the horizon).
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