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My method to take flats:
I use my 27" LCD monitor with the screen made all white in Photoshop.
I put the Newt. on 2 pillows - a white T shirt taped across the front aperture.
I make sure the camera has not moved in rotation or focus.
I put the monitor about 2 feet away from the front aperture
& line it up to be central.
I turn all the lights out & put a black T-shirt over the camera
but not on the heatsink - to stop stray light getting in.
I also block the bottom end of the Newt. with a cover & black cloth.
I bring the camera to the correct identical temperature.
( probably not necessary)
I then take short exposures to go to about half the 16 bit brightness
for all LRGB & Ha filters - 3 frames of each.
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