Deep sky stacker. It is free to download and everyone here uses it. It should import raw DSLR files directly. If it doesn’t there is probably is a freely available add on for your particular camera raw format. Google it.
Import your files Into DSS . Then click register with out stacking and if there are any without many stars , Remove those as bad. Check each one and remove any with bad or elongated stars.
Then check register and stack. You can export as a 16 bit tiff to fine tune in photo shop or as other types of files after stretching and aligning the peaks of the colours. The basic stack is auto saved.
Give it a whirl .
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