I'm actually not certain that's blooming. I'd like to see a FITS image. Check to see if the shutter is working correctly.
A light leak could do this, but it would have to be in front of the shutter. Otherwise it would show up in dark frames. The RBI mitigation...
Can you upload a dark frame, same exposure conditions?
You can get weird shadows if there are no optics on the camera. At least put a piece of white printer paper in front of the aperture, and shoot...
What optics were in front of the camera, if any?
How are you illuminating the camera? There's a shadow in the right, and a bright diagonal line at the top.
It's pretty much impossible to get a diagonal line due to a problem with a CCD sensor. They read out on a grid after all. Watch the operation...
That looks optical. Check the filter wheel and shutter.
Had a couple of hours of clear skies last night, so I grabbed a quick image of M42. Aluma AC455, Ceravolo 300 Astrograph configured for f/4.9,...
Both Colin and I were long-time friends of Dave Lane, who passed away last year. He was the author of a very nice planetarium program called...
You should have a look at our Backfocus Calculator spreadsheet: https://diffractionlimited.com/downloads/BackfocusCalculator.xlsx
That is quite old. There's a simple mod we can do to improve that behavior. If you would like to return it for service, please fill out this...
Years ago I made a minor improvement to the DC restoration circuit in the STX to reduce this phenomenon. If it's old enough it might not have the...
No doubt the warning stickers were removed when the camera was installed. It's also in the user manual. This has always been a warning on all...
That looks like some kind of hardware failure - probably a problem with an internal switching power supply. Unfortunately we no longer have the...
The AUX port on the AC455 is normally used to run the filter wheel. You could make a Y-cable that splits out 12V and ground, and feed that to the...
I'd include the power supply and cable, because we can check that. Up to you if you want to clean up the fans... we'll do it if you don't. If...
You're definitely pushing the limits! The shutter is designed for operations at night. There could be some scattering around the shutter...
There is no difference between StackPro and HighGain if your exposure duration is less than or equal to the subexposure length. The 4040BSI...
Make sure you're in the exact same imaging mode. StackPro will dramatically change your pedestal level (1X to 16X the pedestal level, depending...
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