Even illumination on "top" of Camera sensor, Atik 383L +

[AstroAndy]

Hello Folks

Recently, my Atik 383L + has been showing even illumination on top of the sensor, which hasn't happened before.

I've tested it indifferent environments, on scope, off scope, in a dark box lights, darks, and different exposure lengths.

What it is not:

Stray light coming in from outside

Interference from the pickup prism of my OAG.

Would anybody have any ideas as to what this could be?

I've included images below, on at 60s, and one at 300s.

Any answers much appreciated.

 

Andy

[AstroAndy]

Problem is now solved, there is a preview checkbox in the camera settings (APT), which helps with focusing (faster download), it should be unchecked when imaging. I now have an even unlit frames.