Cant get rid of Amp...
 
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Cant get rid of Amp Glow ?


(@grahamdevenishgmail-com)
Brown Dwarf Customer
Joined: 3 years ago
Posts: 12
Topic starter  
MD IG 120.0 E300.0s ZWO ASI294MC Pro 4144x2822 all channels session 1

 

Hi, I've been using APP for 18months or so with no issues, but over the last couple of days I've come across a problem.  I use a ZWO ASI294MC Pro with a CLS/CCD filter, and never normally have an issue.  A couple of nights ago I shot M101, with 19 Light frames at 300 sec, gain 120, and also 60 flats, 30 dark flats and 16 Dark frames, at the same exposure, gain and temperature and processed the lot in APP Ver 1.079.

No matter what I do I can't get rid of the Amp glow.  I've attached a couple of files from un-processed files to show you.

I use an iMac 2010, with 16gb of ram and OS version 10-13-6 (High Sierra)

Any thoughts as to what I/The software is doing ?

Many thanks

Graham.

M101 Luminance session 1 St

 


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(@rickwayne)
Main Sequence Star Customer
Joined: 3 years ago
Posts: 53
 

Obvious things first: Did you check temp, gain, exposure time on the darks to ensure they're the same as your lights? Is "adaptive pedestal/reduce amp-glow" checked in the Calibration tab? (Unlikely long shot: Are your darks current?)

I'm running the 1.083 beta on Mac OS, but I haven't seen an issue once I learned to be scrupulous about those particular issues, and the 183 sensor has HORRENDOUS glow.

Your second  image  looks as if it's offset from the dark -- you can see two amp glow flowers in it. Don't know what might cause that but it's  sure suspicious.


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(@grahamdevenishgmail-com)
Brown Dwarf Customer
Joined: 3 years ago
Posts: 12
Topic starter  

@rickwayne  Thanks for coming back, the Lights and darks were all 300 sec at 120 gain, at -10 degrees .  The darks were shot the following morning, in a dark box, to avoid any light spill.

I have checked the calibration tab and I do have the  "adaptive pedestal/reduce amp-glow" ticked.

Thanks, Graham


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(@rickwayne)
Main Sequence Star Customer
Joined: 3 years ago
Posts: 53
 

OK, that's my expertise-wad pretty completely shot. Moderators?


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(@grahamdevenishgmail-com)
Brown Dwarf Customer
Joined: 3 years ago
Posts: 12
Topic starter  

Hi,

Another thing I've thought of - When I rotated the scope to take the flats and dark frames, the camera dropped off the back (no damage though) as the 2" adaptor needed more tightening (it's a new scope to me, still learning its ways !)  I put the camera back in the same position, with the filter wheel in the same rotational angle, but any change to the optical train wouldn't affect the dark frames, which influence the Amp glow - at least that's my understanding.  What controls the Amp Glow is Dark frames, or am I wrong ?

Graham


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(@wvreeven)
Galaxy Admin
Joined: 4 years ago
Posts: 1651
 

@grahamdevenishgmail-com You're right. Amp glow is affected by darks and the orientation or even the presence of a telescope won't affect those (apart from possible light leakage). Would you mind uploading your data to

https://upload.astropixelprocessor.com/

using upload2 as username and password? Please create a directory called grahamdevenishgmail-com_amp_glow so we can have a look and help you figure out what's happening. Thanks!


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(@grahamdevenishgmail-com)
Brown Dwarf Customer
Joined: 3 years ago
Posts: 12
Topic starter  

@wvreeven Thanks, do you want the full set of lights, darks, dark flats and flats, or just a sample of a few?  - or just the lights and the master files created ?

Thanks, Graham


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(@wvreeven)
Galaxy Admin
Joined: 4 years ago
Posts: 1651
 

@grahamdevenishgmail-com Let's start with a sample of a few of each 🙂


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(@grahamdevenishgmail-com)
Brown Dwarf Customer
Joined: 3 years ago
Posts: 12
Topic starter  

@wvreeven  Hi, I've just uploaded 5 files of each Lights, Flats and Darks, and 9 Dark flats, named Bias.  Do I need to send an email to support as well or can I assume youve got it ?

Thanks for your help, Graham


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(@wvreeven)
Galaxy Admin
Joined: 4 years ago
Posts: 1651
 

@grahamdevenishgmail-com Got it, thanks!


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(@grahamdevenishgmail-com)
Brown Dwarf Customer
Joined: 3 years ago
Posts: 12
Topic starter  
Posted by: @wvreeven

@grahamdevenishgmail-com Got it, thanks!

Hi, have you managed to have a look at this at all yet ?   I had another go with M101 last night, with my TS71 APO Refractor, 9 lights at 600 secs, just with Dark frames.  I noticed a couple of things, when selecting lights the APP defaults to Sulphur II Session 1, even though I haven't selected this as a channel ( I used to just hit return and APP auto selected "something ??".  

Second, I've attached a .jpeg of last nights efforts, and I know its not the best and it needs flat frames, but there is no evidence of amp glow !  (Also cropped slightly as it vignetted).

The other thing is this time APP ran in about 10 mins, with the other data submitted to you it took hours !!

Both were with the same camera, a ZWO 294MCpro, through ASIAIR.

Hope this helps ?

Screen Shot 2021 03 23 at 19.01.48
M101 600sec Sulphur II session 1 lpc cbg pp

 


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(@wvreeven)
Galaxy Admin
Joined: 4 years ago
Posts: 1651
 

@grahamdevenishgmail-com I have asked Mabula to have a look and unfortunately he hasn't had the time yet.

As for APP selecting SII, that should only happen if the FILTER keyword in the FITS header is set to SII.

The amp glow indeed looks much better processed so that indicates an issue with the flats.


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(@grahamdevenishgmail-com)
Brown Dwarf Customer
Joined: 3 years ago
Posts: 12
Topic starter  

@wvreeven   No worries, I know you're all busy !

Thanks

 

Graham.


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(@grahamdevenishgmail-com)
Brown Dwarf Customer
Joined: 3 years ago
Posts: 12
Topic starter  

@wvreeven Hi again, after you mentioning that the Flats could be an issue, I reran the original data without flats, it ran end to end in 10 mins and no amp glow - Looks like the quality of my flats was the issue !!

Thanks for your help !

Graham

M101 N0 Flats Sulphur II session 1 St

 


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(@wvreeven)
Galaxy Admin
Joined: 4 years ago
Posts: 1651
 

@grahamdevenishgmail-com Hi Graham. Great, I am glad to read that you sorted out the issue.


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