Photography and Imaging

  • Patrick Moore
  • John Watson
Part of the Patrick Moore's Practical Astronomy Series book series (PATRICKMOORE)


The eye can only see what is in front of it at any given time; no matter how long you stare at a dim object, it won’t seem to get any brighter. This is not the case with a camera, which is why photography is such a powerful tool for astronomers. When you use a camera to take a normal photograph the shutter (be it mechanical or electronic) is usually open for a tiny fraction of a second, to ‘stop’ the motion of moving objects. Typically this ranges from 1/100 s to 1/2,000 s for a modern camera, hand-held. As you might expect, ten times more light arrives on the CCD (charge-coupled device) chip (that replaces the film in a modern digital camera) if the shutter is open for 1/100 s than it does if it is open only for 1/1,000 s. Obviously, this is not the same way that the eye works.


Digital Camera Astronomical Object Orion Nebula Dark Frame Focal Length Camera 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.SelseyUK
  2. 2.Old BasingUK

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