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Old 17-04-2020, 03:07 PM
Saturn488
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Location: Melbourne
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Funny looking stars

Was just going through my stacked images now and noticed my stars zoomed up really close look bloody weird.

Equipment
- ASI178MM-C
- ES 102mm APO
- LRGB filters

Could this come down to weather condition or a focus issue?
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Old 17-04-2020, 03:52 PM
glend (Glen)
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Mostly lack of focus would be my guess, but you have some fogging there as well. How are you focusing your setup? Do you have a focus mask?
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Old 17-04-2020, 07:25 PM
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billdan (Bill)
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I thinks its dew / fog on the camera window glass.

Well it was with my QHY12, I have a dew heater now in front of the camera (wrapped around a spacer between the OAG and camera) to heat up the air in front of the glass.
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Old 18-04-2020, 04:06 PM
Saturn488
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@glend
- I use auto focus in Sequence Generator Pro
- I do have a mask but don't need it due to the auto focus

@billdan
- I have a dew band on my scope and on the ZWO camera glass

I was thinking it's the size of my sensor on my camera that is really small.
I did check all my LRGB and the stars looked sharp (Green/Blue they are dim due to the type of filter). It only happens after stacking.

Last edited by Saturn488; 18-04-2020 at 05:03 PM.
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