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Hi Narayan,
Yep, sometimes DSS is a bit of a nancy pants like that.
However, it seems to be the bees knees when you can crack the right combo.
I have attached my DSS settings that I used a while back to process my 1000D subs on the Tarantula Nebula, the 550D should be very similar in the Debayering etc.
Try loading this into DSS using the Settings>Load menu item at the bottom left and selecting the file (wherever you put it). You will need to remove the .txt off the end of the filename so its called DSS beta tarantula.dsssettings for DSS to recognise the settings filename.
Generally, I make sure the RAW/FITS settings are on AHD Debayering and the FITS tab is set to Canon EOS 400D (should be same bayer matrix as both our cameras), then the lights, darks etc are all set to median stacking and I set the Per Channel Background Calibration.
Give it a go and see how you go, if you get stuck, PM me your mobile or home number when you are at home and trying to stack them and I can see if I can Teamviewer your PC and give you a hand with real data on the screen and additionally show you some tips I have since figured out once the stack is complete...
Let me know how you go.
Cheers
Chris
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