Re: DSS Stacking Procedures for Multiple Nights data


Greg D
 

I believe the correct answer for Scenario 2 is 2B - only the Darks and Bias go in the Main group.  If you use Dark-flats, and they're all at the same temperature, they can go in there too.  The per-night things that have illumination (Light, Flats) go in their corresponding Groups 1-n.  If the Darks or Dark-flats are different per night, they need to go with that night's data, not in the main group.

The reason for this is that stuff in the Main group applies to all of the other groups, so putting a set of Flats in the Main group will probably result in an odd mix of flats with the 2nd group's data.

An optimization is that one can put a favorite (generally, based on framing) Light in the Main group and right-click on it selecting it as the "Reference frame".  But don't check it for use, otherwise you can't also load it with the rest of its proper night's data.  Everything else will get registered to that particular frame.

Greg


Martin Dowd via groups.io wrote:

Just a general enquiry regarding how folk stack there data in DSS when imaging over 2 or 3 nights on the same target with the camera removed from the scope each night
I’ve tried both methods in Scenario 2 below with acceptable results   

Stacking Multiple Nights Data in DSS

 

Scenario 1

Camera not removed over multiple nights

( same orientation, temperature and focus ) 

 

Load frames from multiple nights Lights , Darks, Flats, Dark Flats and Bias into Main Group then Check All

Register as normal and then Stack

 

 

Scenario 2 

Camera removed after 1st night and re installed 2nd night and so on....( same temperature and re focused )

Must take new Flats and Dark Flats 

Darks and Bias can be reused 

 

Load Lights , Flats and Bias from night 1 into Main Group

Load Lights, Flats and Bias from night 2 into Group 1 

Load Lights , Flats and Bias from night 3 into Group 2 and so on ….

 

Now register and Stack as normal 

 

DSS will create and save a final calibrated Stacked image file ( FTS ) plus Master Dark , MasterFlat , Master Dark Flat and Master Bias files in appropriate file folder locations 

 

Or ………….

 

Load all Darks ( Darks or Bias ) from multiple nights into Main Group and Check All

Load a single Light frame from night 1 into Main Group , right click and mark it as a “Reference Frame”

Leave this frame unchecked 

Now load all your Lights , Flats and or Dark Flats from night 1  into Group 1 tab and Check All ( no reference frame required)

Then load all your Lights , Flats and or Dark Flats from night 2 into Group 2 tab and Check All

 

Now Register as normal and Stack 

 

DSS will create and save a final calibrated Stacked image file ( FTS ) plus Master Dark , MasterFlat , Master Dark Flat and Master Bias files in appropriate file folder locations 

 

Both above procedures in Scenario 2 work ok but has anyone used another method with good results 
I use a 2600MC OSC cooled camera for both RGB broadband and narrowband imaging with an L Extreme filter 

Thanks in advance 




 

 

 

 

 

 


Join DeepSkyStacker@groups.io to automatically receive all group messages.