Quote:
Originally Posted by mikeyjames
Hi Chris & Rob,
Chris, I hope you don't mind me hijacking your thread with a question for Rob.
Rob, I hope you don't mind a real newb question. I used the white t-shirt method to take some flats the other night. The basically looked like washed out white pictures. Is this what they are supposed to look like? Also, if so, why is focus and orientation so important?
Thanks
Mick
|
Yes, they're supposed to look like white washed-out pictures, with the peak of the histogram just left of halfway along.
Focus is important because it'll affect the amount of vignetting. (Not a lot, but enough.) Orientation will affect the direction of the vignetting. The vignetting is largely what flats are used to eliminate.
Having said that, I get vastly better results if I don't use flats. I've tried using them repeatedly, following all the instructions I've been told or have found, and they invariably end up ruining my stacks. No idea why but I've vowed that tonight's effort was the last time I tried them until I know better why they screw everything up every time!