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Old 21-05-2013, 04:28 PM
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gregbradley
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Join Date: Feb 2006
Location: Sydney
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Certainly too high an ISO comes at a cost of lost dynamic range.

That point would vary for different cameras and manufacturers.
It would be worth knowing where that point is.

But other factors come into it - like tracking or no tracking, dark sky or not dark sky.

One thing that is important is you can't change ISO afterwards in RAW. What a shame as it would make all this unnecessary.

Greg.
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