ANNULAR SHADOW ON IMAGE BY ASI 294MC PRO

dear All,

I just purchased my new ASI ZWO 294 MC and tested.

I took the following image where you can see the annular shadow in the center of image.

what is the reason?

How can I avoid it?

CELESTRON CPC 800 XLT+EQUATORIAL WEDGE

CELESTRON FOCAL REDUCER F/6,3

ASI ZWO 294 MC PRO

ANTIPOLLUTION FILTER BETWEEN FOCAL REDUCER AND CAMERA ADAPTER

INTEGRATION 10 FRAMES EACH 10 SECONDS

many thanks for support

francesco

Looks like optics reflection. please take away all unnessary accessaries, such as reducer, extenders, just use the camera and telecope for testing.

Thanks! I took out filter and the problem seems to be solved. I will recheck and in case report you.

Thanks for quick support

Francesco

OK, that's good news, looking forward to your update.