Digital ISO

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The article touches on digital ISO, i.e. ISO settings for digital cameras.

ISO (international standards organization), in the context of photograph, is a light sensitivity measure. Higher ISOs, generally, require shorter exposure times and allow one to take pictures in environments with low light. Lower ISOs, generally, require longer exposure times.

Historically, in the context of film, the trade-off of higher ISO films (with shorter exposure times) was an increased graininess, i.e. lower resolution.

General

  • ISO adjusts the gain of the sensor.
  • Each camera has its own native ISO, which is dependent on the chip, and cannot be adjusted.[1]
  • Shooting below the native ISO degrades the picture.[2]

Rebel XSi

The native ISO is ~ 200.[3][4]

See also

References

  1. ↑ URL: http://www.picturecorrect.com/tips/iso-setting-in-digital-cameras/. Accessed on: 8 February 2011.
  2. ↑ URL: http://www.cameralabs.com/forum/viewtopic.php?t=4503. Accessed on: 9 February 2011.
  3. ↑ URL: http://www.flickr.com/groups/canon450d/discuss/72157605063060464/. Accessed on: 8 February 2011.
  4. ↑ URL: http://www.outbackphoto.com/CONTENT_2007_01/section_gear_cameras/20080329_Canon_450D/index.html. Accessed on: 8 February 2011.
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