I did and the images turned out worse than without flats.
Yes, i figured it looked off as my usual flats never looked like that, but that was with an ASI533MC Pro with a smaller sensor. I will try to upload my other calibration frames when i get home from work.
I usually take my flats after my imaging session with a white t-shirt and a light panel. ASIAir calculates the exposure time, i believe for this flat was around 330ms.
Yes it is a full frame camera. The Esprit 120 with flattener (no reduction) is 44mm image circle, while the sensor for the ASI2400 is 43.3mm.
My current image train starting from the focuser is Focuser -> Flattener (Needs 75mm back focus) -> M62 to M48 Adapter (20mm) -> M48 Spacer (16.5mm) -> M48 to M54 Adapter (2mm) -> ZWO Filter Wheel (20mm) -> Camera (16.5mm to sensor with tilt plate)
Could the M48 spacers be the issue not being wide enough for full frame?
Many thanks and much appreciate all the replies!