Exposure and Camera Modes

• Exposure determines how light or dark an image will appear
• Aperture, ISO and shutter speed together are known as the “exposure triangle.”
• Aperture controls the light that enters your camera
• Shutter speed controls the duration of the exposure
• ISO speed controls the sensitivity of your camera’s sensor to a given amount of light
• Aperture affects depth of field
• Shutter speed affects motion blur
• ISO speed affects image noise
• Depth of field is the range of distance that appears acceptably sharp.
• Image noise is the digital equivalent of film grain
• A camera’s shutter determines when the camera sensor will be open or closed to incoming light from the camera lens.
• How much light that is let into the camera lens is determined by the shutter speed
• Both “shutter speed” and “exposure time” belong to the same concept, where a faster shutter speed means a shorter exposure time
• Shutter speed is the setting that has the widest range of possibilities
• Shutter speed is meant to freeze or exaggerate the appearance of motion
• Increasing shutter speed can help fix a blurry picture
• “Stopping down” and “opening up” lenses refer to increasing and decreasing the f-stop value.
• ISO speed determines how sensitive the camera is to incoming light.
• A lower ISO speed is almost always desirable
• In a camera’s aperture, lower f-stop values correlate with a shallower depth of field

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