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Old 26-08-2015, 03:59 PM
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multiweb (Marc)
ze frogginator

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Join Date: Oct 2007
Location: Sydney
Posts: 22,062
Image scale and stellar profiles

As you know I've acquired a FSQ106N last year and I've been imaging with it quite a lot lately. One thing I have noticed is that I tend to burn star cores a lot more since I've used that scope.

Check the attachment below zoomed at 300%. That's a 5min sub (debayered to LUM) in the area of the veil nebula. The veil itself is quite faint. I did a bit of 10min subs but mostly 5min which is not long by any standard. Even though the "brightish" stars are burnt.

At first I thought something had changed in my processing flow but when I checked the raw files the stars are already saturated.

Is this a side effect of under sampling? Or should I go for shorter subs? Or do I need a camera with smaller pixels? This is a QHY8 btw.
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