since last week I have a similar (or the same?) problem.
The ASI294 ist always mounted to the RASA 11", everything
is dry and unchanged for months.
I attach an (extremely stretched) screenshot.
In the center the problem is obvious, but some areas
on the left and the right are also affected.
that the problem is caused by humidity.
As I didn't remove the Camera from the telescope
I can‘t say if its on the inside or outside of
the front glass or on the sensor.
What can I do?
Sorry for the problem.
For the current, we still did not know what caused this problem. But there is a method could solve this problem now.
When the camera reach the target temperature after cooling, please wait for at least 20 minutes. According to our test, usually, this phenomenon will disappear after the waiting.
I already tried this and for a while it worked.
Unfortunately the phenomenon ist getting worse over time.
Waiting over 3 hours didn't help.
As soon as the sensor temperature is lower than about
15 degrees below the environment temperature the