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Yes, Maxim calibrates each image first before combining. It searches your calibration database for the appropriate frame to calibrate with. You should have this database loaded with all the master calibration frames (prestacked) required for each filter (darks and flats, depending on how you set cal up) and the FITs headers must be consistant for the process to work properly. Making master calibration frames is a seperate proceedure you must do 1st.
Although I use DL for creating calibration frames, I use CCDstack for processing images. Its more manual but gives more control and superior results.
Overall though, DL is fine and gives fast (automatic) results for all but the most difficult raw data.
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