Quote:
Originally Posted by ZeroID
You need some 'ISO' to amplify enough photons to get an image to work on. If you imaged at 100 ISO eg you would probably need about 20 hours of stacked images to get enough photons to work with. By going to 800 ISO eg you amplify the signal the photon creates at the sensor and it takes 1 or 2 hours to get enough.
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As I basically said Ken ... 'amplify enough photons'
Worded differently but it's the same message.