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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