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Understanding Exposure. Canon EOS Rebel XS. The Aperture. Inside every camera lens is an opening called the aperture, which works in exactly the same way as the pupil in a human eye .
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Inside every camera lens is an opening called the aperture, which works in exactly the same way as the pupil in a human eye. • In a camera, the degrees of this change is measured by an "f-stop". Typical values are f2.0, 2.8, 4.0, 5.6, 8.0, 11, 16, 22, 32. • F-stops represent a doubling or halving of light. To keep a constant exposure, you have to adjust the shutter speed accordingly. The Aperture (f-stop)
The shutter lies in front of the sensor and controls how much light is let in. • Your average camera will have shutter speeds as follows:4000, 2000, 1000, 500, 250, 125, 60, 30, 15, 8, 4, 2, 1s, 2s, 4s, 8s, 15s, 30s • Most shutter speeds are fractions of a second. The much slower second times are often marked with a “s” behind the number (e.g. 1s, 2s, etc.) The shutter
The Aperture and Shutter work together to maintain a proper exposure, but each has another important function. • The shutter can also blur or freeze action, while the aperture controls depth of field. • And now a short video explanation of each: • Shutter Speed/Depth of Field Shutter & Aperture