PHD2 problem with hot pixels!
- UlteriorModem
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PHD2 problem with hot pixels!
No problem you say? Just create a dark library, or a bad pixel map.
Thing is that with the Starlight Express guide camera when you go to shoot the bad pixel map frames the image is swamped by noise and you cannot see the bad pixels. The Starlight Express is kind of odd in that if there is no signal or stars in the field it just kind of fills with white noise. Only when it 'sees' an actual star does the background turn black?
I made a new dark library last night and used that but one bad pixel in particular is still there. One time while doing a drift alignment I thought I had nailed it! Near perfect guiding.... oh that's a hot pixel!
Anyhow anyone have experience with this issue? Any hints or tips I might try?
My thanks in advance.
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Re: PHD2 problem with hot pixels!
If I catch a break I'll look for it. Then again, maybe you shouldn't listen to someone who
manages to have PHD correct in the wrong direction & hasn't figured it out yet....
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Re: PHD2 problem with hot pixels!
Current Equipment:
Mount: Celestron CGX-L
Scope: 130mm f7 APO
Cam: ASI071mc-pro
- yobbo89
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Re: PHD2 problem with hot pixels!
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .
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Re: PHD2 problem with hot pixels!
I get this too, it's like the dark frame doesn't get applied until phd detects enough signal.UlteriorModem wrote: ↑Tue Nov 26, 2019 3:29 pm Only when it 'sees' an actual star does the background turn black?
My thanks in advance.
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .
- UlteriorModem
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Re: PHD2 problem with hot pixels!
If you run the bad pixel map without the camera looping it leaves the background dark and pops up little red dots if show bad pixels is selected. I guess to manually add a hot pixel it will have to be looping and actually have some stars in the background. Otherwise no matter the settings you just get a screen full of white noise.
I ran it and it found 57 hot pixels and 0 cold. I may need to back down the tolerance some but for now I am going with the bad pixel map as it is.
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Cam: ASI071mc-pro
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Re: PHD2 problem with hot pixels!
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Re: PHD2 problem with hot pixels!
Why can't you run the bad pixel map using the L, or no filter?
does the number and/or position of them change when switching filters? I would think not.
So, a map can be made using no filter, matching the exposure duration and it should come out OK, No?
just a thought...
- UlteriorModem
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Re: PHD2 problem with hot pixels!
The last one I shot by running the BPM
What we are talking about is the ability to manually add a hot pixel to the already generated bad pixel map. The problem is that if the Starlight Express does not have any signal (stars) all you get is a screen full of white noise. It of course is impossible to see any hot pixels amongst all that noise. But once it picks up a star poof the background turns to dark and smooth. With some signal and a 'good' background I just pan around a little and the hot pixels should be obvious since they dont move. I did that last time out and saw no obvious hot pixels so the BPM must have worked.
It is just an oddity with some guide cameras.
Current Equipment:
Mount: Celestron CGX-L
Scope: 130mm f7 APO
Cam: ASI071mc-pro
- seigell
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Re: PHD2 problem with hot pixels!
You should be able to let PHD2 product the BPM for you. Else Capture an Image to File, and then open that TIF / JPG to identify your Hot Pixels.
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- UlteriorModem
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Re: PHD2 problem with hot pixels!
Current Equipment:
Mount: Celestron CGX-L
Scope: 130mm f7 APO
Cam: ASI071mc-pro
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