I had a question regarding bias and flat frames. Assuming I use the same camera, ISO, lens and focal length, can I use the same bias and flat frames? Wouldn't the flat frames always be the same for a particular lens? How would it be different from correcting vignetting with lens correction in lightroom or peripheral illumination correction in DPP?
After reading the DSS FAQ, I understand light, dark and flat frames, but I do not understand how bias frames work.