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Understanding Exposure

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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Understanding Exposure

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  1. Understanding Exposure

  2. Canon EOS Rebel XS

  3. The Aperture

  4. 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)

  5. The shutter

  6. 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

  7. Exposure controls

  8. Deciphering the numbers

  9. 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

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