Quote:
Originally Posted by cometcatcher
For daylight photos, yes but not for astronomy. With my Pentax for instance, 15 seconds at ISO 6400 is equal to (after stretching) 15 seconds at ISO 400. The noise increases at virtually the same rate as gain.
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Once you start "stretching" the whole ball-game changes. Lets keep the playing field even.
Just compare exposures.
Robert