At 8:53 PM -0700 8/3/05, Ken Durling wrote:
Can anyone briefly explain or point me to a site that explains what
we are changing when we change ISO on a digital camera? Is it a
change in some amplifier gain? And what actually causes the
attendant "noise?"
Thanks
Ken
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Yep. It's amplifier gain. For more detail, see:
http://clarkvision.com/imagedetail/digital.signal.to.noise/
and some of the references and other stuff on his site.
The regular 'ISO' speeds on digital cameras are those where the
colour/density response curves can be met to be compliant with the
ISO standards. The non-ISO speeds (like 'H' on the 20D) are not
withing ISO specs, even though they are quite useable. Photoshop
and/or Canon's software and firmware can make these work.
--
* Henning J. Wulff
/|\ Wulff Photography & Design
/###\ mailto:[EMAIL PROTECTED]
|[ ]| http://www.archiphoto.com
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