AllSky Issues

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brenski
Posts: 15
Joined: Mon Aug 10, 2020 4:01 pm

AllSky Issues

Post by brenski »

Am quite new to this and have tried to follow the instructions/tutorials.

Having major issues with hot pixels. I tried using darks, but alas, it's not helped as much as i thought it would.
as you can see - i've a way to go to get the hang of this, so any help/advice is welcome.
images below: Dark and two captures from last night.

Allsky Equipment:
Zwo ASI120MC, Allskydome, 12v dew heater ring. Sharpcap Pro 3.2.6232.0

Sharpcap Settings:
[ZWO ASI120MC-S]
Pan=0
Tilt=0
Output Format=PNG files (*.png)
Binning=1
Capture Area=1280x960
Colour Space=RGB24
Temperature=2957
High Speed Mode=Off
Overclock=0
Turbo USB=86(Auto)
Flip=Both
Frame Rate Limit=Maximum
Gain=98
Exposure=8.70083
Timestamp Frames=Off
White Bal (B)=87(Auto)
White Bal (R)=57(Auto)
Brightness=19
Auto Exp Max Gain=53
Auto Exp Max Exp M S=43017
Auto Exp Target Brightness=123
Mono Bin=Off
Banding Threshold=35
Banding Suppression=0
Apply Flat=None
Subtract Dark=C:\Users\USER\Desktop\SharpCap Captures\darks\ZWO ASI120MC-S\RGB24@1280x960\8.7s\gain_98\dark_5_frames_2957.0C_2020-08-14T21_14_59.png
#Black Point
Display Black Point=0
#MidTone Point
Display MidTone Point=0.5
#White Point
Display White Point=1
TimeStamp=2020-08-14T21:16:04.7451971Z
SharpCapVersion=3.2.6232.0


Dark and 2x Captures:
dark1.jpg
dark1.jpg (767.15 KiB) Viewed 498 times
Capture1.jpg
Capture1.jpg (967.1 KiB) Viewed 498 times
capture2.jpg
capture2.jpg (562.54 KiB) Viewed 498 times
Skywatcher 130p Alt-AZ (Starsense for skywatcher) ♦ Bresser AR90S 90/500 ♦ Bresser 70/350 ♦ Zwo ASI183MC Pro (cooled) ♦ SVBony SV205 ♦ Canon 200d ♦ Samyang 14mm F/2.8, ♦ Samyang 85mm F/1.4 ♦ Omegon Minitrack LX2 ♦ Skywatcher Star Adv Pro ♦ Fiji WS1 3D
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admin
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Location: Vale of the White Horse, UK
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Re: AllSky Issues

Post by admin »

Hi,

probably not the answer that you wanted to hear, but the 120 MC camera is not particularly well suited to this sort of role because of the hot pixel problem. It will likely perform better once the weather turns colder however as the hot pixels are strongly linked to the temperature of the sensor (you can connect Peltier to it and massively improve the hot pixel problem, but in an all sky camera mounting you have to ask the question of where would the go if you did that?).

The more modern Sony sensors in cameras like the 290 or the 224 seem to cope much better when used for the longer exposures that an all sky camera requires.

Cheers, Robin
brenski
Posts: 15
Joined: Mon Aug 10, 2020 4:01 pm

Re: AllSky Issues

Post by brenski »

Hi Robin

thanks for the reply.
my thoughts exactly re: Peltier - there's very little room inside the enclosure - Peltier maybe, but no room for heatsink and fan.

no i just need to source a reasonably-priced 290 or 224
Skywatcher 130p Alt-AZ (Starsense for skywatcher) ♦ Bresser AR90S 90/500 ♦ Bresser 70/350 ♦ Zwo ASI183MC Pro (cooled) ♦ SVBony SV205 ♦ Canon 200d ♦ Samyang 14mm F/2.8, ♦ Samyang 85mm F/1.4 ♦ Omegon Minitrack LX2 ♦ Skywatcher Star Adv Pro ♦ Fiji WS1 3D
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turfpit
Posts: 1353
Joined: Mon Feb 13, 2017 8:13 pm
Location: UK
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Re: AllSky Issues

Post by turfpit »

brenski
Posts: 15
Joined: Mon Aug 10, 2020 4:01 pm

Re: AllSky Issues

Post by brenski »

Hi Dave

thanks for the link - it pretty much confirms ms suspicions:

> my all-sky enclosure just doesn't have the room for the extra gear. peltier, maybe, but definitely not the heatsink and fan
> even if there were room, the current 12v line supports the dew heater and maybe could be shared with a peltier, but i don't think it would support a fan as well?

i think i'm likely headed down Robin's suggestion of a better camera - at least i can recover some funds by selling the 120mc
Skywatcher 130p Alt-AZ (Starsense for skywatcher) ♦ Bresser AR90S 90/500 ♦ Bresser 70/350 ♦ Zwo ASI183MC Pro (cooled) ♦ SVBony SV205 ♦ Canon 200d ♦ Samyang 14mm F/2.8, ♦ Samyang 85mm F/1.4 ♦ Omegon Minitrack LX2 ♦ Skywatcher Star Adv Pro ♦ Fiji WS1 3D
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