Sensor Temps

beachbum

I was wondering in the winter months if I should raise the camera temperature some on this ZWO I have. I've been at -10C all summer and fall. Now for some reason I'm seeing some strange looking circular artifacts at the center of one of my images. Different color than the dark nebula I'm imaging.

This is not a good image by any means but you can see the disturbance at the center. No post processing has been done yet. This is straight out of APP

This is an ASI294MC Pro, a tad over two years old...I already replaced the desiccant tablets too, BTW...But I'm wondering due to the 52 degree F cool nights with this higher dew point can this be causing the mark...?

Any ideas?

Thank you,

Rod

wvreeven

beachbum Dew or frost on the camera could be the cause. Do you see this in the flats as well? If yes, do you see it as well when cooling only to 0° or +5°?

beachbum

wvreeven

I don't see this in the flat frames. I will set it up to 0 or +5 tonight and go again...We're having very clear skies here at 50-52 degrees, but with a lot of dew. That may be it.

I was thinking of ice crystals or something of that nature. Looks sort of like different colors like a prism. Moisture may cause that.

beachbum

wvreeven

Went back and took a closer look at my flat frames and found that mark. May have come from my T-shirt. I have the scope outside tonight. Tomorrow I'll do some new flats outside early morning sun. It's a clear cool day...

Thanks for the tip..!! Here's one of the flats. Zoom in on that circle.

Rod