Re: [Utah-astronomy] Flat Field Frames

Hi Deb, My CCD instruction manual doesn't say the frames have to be focused. One technique recommended is to do it when the sky is fairly evenly lighted (and I think for safety sake, this should be before the sun goes up or after it sets). You can stretch something like a piece of cloth evenly across the tube to diffuse the light further, then make the exposures. I have to admit that while I made several flat-field photos, I don't think I was able to actually use them. Best wishes, Joe