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Old 19-07-2014, 07:49 PM
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astronobob (Bob)
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Are these Dark Frames Normal?

HiYall,

Ive taken my 1st set (20 subs) of Darks with the QHY 10 OSC (One Shot Color) 400 seconds @ -35deg. I did them between 2am & 4am after an image session on the triffid.
Strange thing to me is that they have come up brighter than the Light frames of the Triffid ?
I had the Newts 10" front Lid on and had a black towel wrapped about it, and also had another black towel around the rear Mirror cell end as its Not closed - so just thinking on the safe side
I was also catching some shut eye at the time in the Obs, so, no lamps on
All Dark sub are very identical, smooth even lighting over the entire chip !
But they have turned out a rather medium to light grey shade ??

Here is a couple of Screen Snips of a Dark Frame.
1st is (Full Frame) with a Linear streach & 2nd is same Linear Steach Dark @ 100% view,
3rd is (Full Frame with ArcSinH(x) Streach & 4th at 100% View with ArcSin(x) Streach ?

Also A Lightframe at Linear & ArcSin(x) Streaches !

Interesting seeing the Light Frames in the same streached manor and they are quite a bit Darker than the Darks
Normal or Not ?
Thanx ,,,,,
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  #2  
Old 19-07-2014, 10:36 PM
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Eden (Brett)
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Location: Melbourne, Australia
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Hi Bob,

This is normal, mate. I've attached one of my own darks, captured with the QHY12 (which is also one shot color, like QHY10) at -18.

I have set the white and black levels in the screen stretch window to similar values you have in your screenshot to demonstrate. I captured mine with the lens cap on the camera but the way you did it with the scope lid on is just as effective.
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  #3  
Old 19-07-2014, 11:54 PM
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astronobob (Bob)
Casual Cosmos Capturer

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Join Date: Jun 2010
Location: Gold Coast SE QLD
Posts: 4,190
Hey Thanx very much for That Eden
I was using the rig for 5 nights straight in the Obs, so had no reason to take the qhy off, and wanted to grab them then & there while air temps were near zero and the sky turned to cr*p ! Looking forward to processing them into the mix
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