I have been experiencing a noise problem on my 294MC pro camera.
When the TEC cooler is running at high power (say 90%, cooled to -15c at room temp), it starts to show black dots in the middle of the frame.
I know that it's best to keep cooler run at lower power, but I was capturing flats inside and this is the first time I noticed this.
Here's some image for comparison.
TEC %90 (-15c) TEC %30 (0c) Image processed with defective flats Is my camera damaged? or is this a known issue?
Ok, but how is this normal? it's sometimes there and sometimes not.
In fact, the third picture is 2 hours of data just ruined by 50 flats (1st image)
Some of the members from the Facebook group said that the camera should be cooled gradually otherwise this will happen. Is it correct?
You can avoid it, if you set the target temperature a few degrees
higher (about 20 degrees below environment temperature).
That's not perfect, of course, but better than loosing frames …
As soon as the nights here in Germany are too short and too bright
to take photos, I will try to dry the desiccant tablets and install
a camera window heater. I hope this solves the Problem.