I have usually had quite a lot of success with flat frames however after i have added i fieldflattener to my setup it seems like they have limited effect in DSS
My method is two layers of white t-shirt with an ipad screen shining white light and shooting in Av mode on my Canon 550d making sure the exposures are all the same length
Here is my autostretched (in Siril) masterflat, it seems quite faint in my opinion:
And here are two of the images i get from the flats in DSS:
Edited by HSkaane, 15 January 2022 - 05:42 AM.