[Aavso-photometry] Reality Check - Basic Concepts (Flats)

[David Trowbridge]

I generally take my flats right after sunset, aiming the telescope low in
the eastern sky at an azimuth roughly opposite to where the sun went down. I
put a T-shirt over the end of the telescope and take 4-5 images with each
filter, then stack them. Would aiming higher in the sky, close to the zenith
give better flats?

Occasionally I use a light box with incandescent bulbs, but it requires a
long exposure, especially with the B filter. I probably need to replace the
incandescent with halogen bulbs.

David Trowbridge