I seem to be facing an issue with the 585 mono version. it does that after recycling through filters, After shooting through the last filter “B” when it moves back to “R”, the image brightens almost as if its read out mode has been changed, the mean value jumps from 3000-4000 to 9000-10000.
585 mono camera brightness jump when cycling back to red filter
📷 Screenshot_20260610_223915_Chrome.jpg
📷 Screenshot_20260610_223922_Chrome.jpg
📷 Screenshot_20260610_223503_Chrome.jpg
1st image shows the shift that has brightened the image significantly
2nd image shows previous image at normal mean value
3rd image shows the jumps in the mean value
What’s your sky quality like? bortle rating? Is your light pollution predominantly caused by red/orange light? or do you have any bright red lights around your rig?
Have you done the the firmware update on your ToupTek Filter wheel? The older firmwares were known for having an issue where an internal red diode would not turn off during exposures. This could cause a light bleed, specifically in red light…
Have you checked to see that when the red filter is selected, the filter centers nicely over the sensor? The vignnetting pattern shown in the images almost appears as if the filter is not landing on the sensor correctly. This s would however, typically cause a sharp drop in mean ADU’s, not an increase.
I would look at your light pollution/stray red light situation, and investigate the AFW firmware upgrade to diagnose the issue first.
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That first image is very telling of filter misalignment. Try disabling unidirectional filter wheel movement, if your filter wheel has it.
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Alex Nicholas · Jun 11, 2026, 04:40 AM
What’s your sky quality like? bortle rating? Is your light pollution predominantly caused by red/orange light? or do you have any bright red lights around your rig?
Have you done the the firmware update on your ToupTek Filter wheel? The older firmwares were known for having an issue where an internal red diode would not turn off during exposures. This could cause a light bleed, specifically in red light…
Have you checked to see that when the red filter is selected, the filter centers nicely over the sensor? The vignnetting pattern shown in the images almost appears as if the filter is not landing on the sensor correctly. This s would however, typically cause a sharp drop in mean ADU’s, not an increase.
I would look at your light pollution/stray red light situation, and investigate the AFW firmware upgrade to diagnose the issue first.
Sky quality and the bortle zone dont matter because just a few mintues ago the condition was perfect. the weather did not change at all during the filter and autofocus process
I havnt done the FW update, i just came across this topic, and will update that first thing. I was under the impression that it was a camera issue, but based on the threads i can recognize the pattern.
Hassaan Zaheer · Jun 11, 2026, 11:09 AM
Sky quality and the bortle zone dont matter because just a few mintues ago the condition was perfect
Sky quality and bortle do matter, because if your local skyglow is predominantly sodium light, red will be heavily affected and blue won’t, as most blue filters cut off at 500nm, and they tend to encompass the 400~500nm range. Sodium light pollution is at 589nm, squarely in the red/green spectrum of 575~675nm…
Same would be true if you had a relativley bright red light somewhere near your telescope.. this would probably not affect a blue frame at all, but would absolutely destroy images with a red filter…
Anyway, check the filter wheel update… I never had the issue with my ToupTek AFW, but a friend certainly did.
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Alex Nicholas · Jun 11, 2026, 01:15 PM
Hassaan Zaheer · Jun 11, 2026, 11:09 AM
Sky quality and the bortle zone dont matter because just a few mintues ago the condition was perfect
Sky quality and bortle do matter, because if your local skyglow is predominantly sodium light, red will be heavily affected and blue won’t, as most blue filters cut off at 500nm, and they tend to encompass the 400~500nm range. Sodium light pollution is at 589nm, squarely in the red/green spectrum of 575~675nm…
Same would be true if you had a relativley bright red light somewhere near your telescope.. this would probably not affect a blue frame at all, but would absolutely destroy images with a red filter…
Anyway, check the filter wheel update… I never had the issue with my ToupTek AFW, but a friend certainly did.
It was the FW, updated the firmware amd it is working like a charm