Recommended Settings for Combining Flats
NOTE: Flats must be dark subtracted. If they have been normalized in a different program then you can uncheck the Normalization option.
|Combine Method||Standard Deviation Masking|
|Normalization||Check on and try 60%.|
|Ignoore Block Border||Uncheck|
|Sigma Value||0.5 to start - Shoot for about 98% usage of each image in the results dialog|