Are these Dark Frames Normal?

[astronobob]

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 :question:
I was also catching some shut eye at the time in the Obs, so, no lamps on :question:
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 :shrug:
Normal or Not ?
Thanx ,,,,,

[Eden]

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. :thumbsup:

[astronobob]

Hey Thanx very much for That Eden :cool2:
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 :thumbsup: