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Gain and offset adjustment for long exposures


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#1 peter_4059

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Posted 22 July 2008 - 03:25 AM

Hi all,

I would like to know what adjustments need to be made (vs default settings) to the gain and offset sliders when you start using longer exposures.  I've recently got autoguiding working aand have experimented with 2min subs but the histogram looks like it is nearing the top end of the scale.

Thanks,

Peter

#2 Mark Sibole

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Posted 22 July 2008 - 05:52 AM

Gain 100  offset 50.
Ive used these settings up to 15 minute subs.

Mark
Mark Sibole
MTSO Observatory
Fife Lake, Mi.

http://astronomy.qteaser.com

#3 peter_4059

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Posted 23 July 2008 - 02:11 AM

Thanks Mark,  is there ever a situation when you change these from the defauls 100/50 settings?  What does offset do?

Peter

#4 StevenSWissler

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Posted 19 January 2010 - 03:23 PM

The documentation for nebulosity 2 has a very good description of this topic. It's woth downloading the pdf and reading it, even if you chose not to use nebulosity. It's probably one of the best user's manuals I've ever seen...

#5 Tony

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Posted 02 June 2010 - 04:14 PM

Nebulosity's focusing program works wonders for focusing your DSI as well... with Envisage it was always a guess which turned out to be soft... so focus with neb, capture with envisage for simplicity...
cheers




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