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Re: Camera's Dynamic Range Question

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  • Wayne Cooper
    Thanks for explaining this. Much appreciated. Sincerely, Wayne And Have a Happy New Year ... as other ... range, ... capture ... 100% more ... low noise ...
    Message 1 of 3 , Dec 31 10:54 PM
      Thanks for explaining this. Much appreciated. Sincerely, Wayne
      And Have a Happy New Year

      --- In ccd-newastro@yahoogroups.com, "Wodaski Yahoo" <yahoo@n...>
      > Dynamic range is good to have, but not as dramatically important
      as other
      > things (like low noise). Low noise does give you a greater dynamic
      > but other aspects of low noise are much more important.
      > The beauty of a large dynamic range is that you can simultaneously
      > bright stuff and dim stuff, and retain detail in both. So having
      100% more
      > dynamic range means that you will have fewer saturated stars. The
      low noise
      > that creates this increased dynamic range will contribute
      something far more
      > valuable: the dim details will have less noise, and there will be
      more steps
      > _inside_ that particular range of data. In other words, subtle
      details will
      > be easier to see with a given exposure time. So the extra steps
      pay off in a
      > second way, too.
      > Ron Wodaski
      > The New CCD Astronomy
      > http://www.newastro.com/ipb
      > -----Original Message-----
      > From: Wayne Cooper [mailto:coopersx@c...]
      > Sent: Friday, December 31, 2004 9:54 PM
      > To: ccd-newastro@yahoogroups.com
      > Subject: [ccd-newastro] Camera's Dynamic Range Question
      > Skimming thru Ron's 1st book this evening the subject "Dynamic
      > Range" came up. Pg 435-436 Chpt 9. Galaxy image processing. Very
      > interesting. The dynamic range of a ccd camera determines the
      > brightness levels the camera is able to record in an object. A
      > camera with a small dynamic range will record mostly extreme black
      > or white and miss all of the nice shades in between. Sbig states
      > that the "dynamic range" of a camera can be estimated by dividing
      > the camera's full well capacity by the read noise.
      > I have an ST2000XM camera. Sbig updated the chip used in this
      > camera. The fullwell capicity has not changed....but the read
      > has been cut in 1/2. I thought nothing of this and did not think
      > was a big deal untill now. Does this mean the newer ST2000XM
      > has *twice* the dynamic range then the older model. If so will the
      > newer camera now produce images that have a dramatic increase in
      > long scale contrast...in escence displaying all of those subtles
      > shades of grey that may be missed by the older model. Sounds like
      > their should be a 100% increase in the camera's dynamic range.I
      > would think this would be the main advantage of lower read
      > Dynamic range is not mentioned anywhere in Sbigs advertisment for
      > this camera. Will this increase be visually apparant in a side by
      > side comparison...or is their something more important about the
      > lower read noise other then the dynamic range? Thanks, Wayne
      > Yahoo! Groups Links
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