[vic4loc (Victor)]

I'm trying to capture flats, not sure if I'm doing it correctly.

I have a LX90 8" and QSI583, I simply point the scope about 20 Dec west at sunset, put the scope out of focus, took a few shots to get the average ADU value around 25000-30000, and got the image below.

What is that blob in the middle? Is this the expected flat image from an SCT? Do I need to put the scope into focus?

I have tried putting a white cloth over the scope, still getting that blob in the middle.

Any advise would be greatly appreciated.

Victor.