Quote:
Originally Posted by White Rabbit
800 for me, when time is in short supply you need to catch as many photons as you can. I'd go 1600, buy on a 1000D it looks pretty bad.
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The number of photons caught has nothing to do with the ISO setting. Photons hit the telescope objective and are reflected onto the sensor. Changing the ISO can't generate any more. If you expose at 400 ISO for 10 min or 800 ISO for 10 min, you collect exactly the same number of photons.
Geoff