The Flame and Horsehead!

Started 3 months ago | Discussions thread
Jared Willson Senior Member • Posts: 1,124
Re: The Flame and Horsehead!

82Virago wrote:

Very nice. ISO 200, that is surprising. I am understanding more why questions regarding astro mods are popping up .

I have about the same integration time, but at ISO 1600, non modified, much noisier as would be expected.


The D7200 is very nearly ISO invariant, meaning that shooting at ISO 200 and boosting exposure in software by three stops has no real penalty in terms of noise performance vs. shooting at ISO 1600. This can help on subjects like the Horsehead with bright stars since it allows lots of dynamic range in each sub—less tendency to clip highlights at the lower ISO. Differences in noise are probably down to Ha sensitivity, sky quality, and processing rather than ISO used.

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