no you ain't no nuisance Raymo! I must be since I called the Flat the wrong name...
Flats may look very flat, but again, if you up the contrast, you might notice some vignetting or the dreaded dust mote (you'll see I have at least 3 and growing...).
It's easy to take flats early on in the evening, take a pic of some clear sky before it gets dark, I've been told to take around 20-30, make sure you keep your camera in the same position as you'll be using it in the night. Just set your cam to automatic, or shutter speed priority, around 1/60th a sec might suffice, or faster.
Light frames are just the raw images you take, of the pretty space thingies
