Deep Sky Stacker Batch Stacking problems-please help!

[Costas Soler]

Hi!

I have about 4 hours worth of data from M51. I captured my subframes with my 8" Orion Newtonian Astrograph and my Nikon D3200. About two hours of data are from 30 second exposures (some at ISO800 and others at ISO100). The rest are 4 minute exposures at ISO800 (these were captured after I bought my Orion Starshoot SSAG). In order for DSS to align these frames, I need to have different star detection thresholds for the 30 second subs and the 4minute subs. I tried doing this by using batch Stacking, but it still uses the same detection threshold for all the file lists (or so I think, since at 20% it stacks almost all the 4 minutes, but at 6-7% it only stacks one of the 30 second frames). And fyi, when stacking only the 30 second frames, there is no problem making an image. Stacking only the 4 minute subs also shows no problems. Let me know any ways you can think of to resolve this. I appreciate it!

[The-MathMog]

Sorry but I don't have a solution to getting dss to work that out for you. But why not just manually stack the two outputs, the stacked 30 second frame and the stacked 4 min one? It can easily be done in either photoshop or gimp which is free and then you can also experiment with different opacities, to either favor more of the 4 min data or more of the 30 second data, or only using the 30 second data for the cores.
The stacking itself can easily be done with the blending modes, where "difference" mode is a great tool, and then turning one layer on and off to see if they line up properly

[Atreta]

4 hours ago, Costas Soler said:

Hi!

I have about 4 hours worth of data from M51. I captured my subframes with my 8" Orion Newtonian Astrograph and my Nikon D3200. About two hours of data are from 30 second exposures (some at ISO800 and others at ISO100). The rest are 4 minute exposures at ISO800 (these were captured after I bought my Orion Starshoot SSAG). In order for DSS to align these frames, I need to have different star detection thresholds for the 30 second subs and the 4minute subs. I tried doing this by using batch Stacking, but it still uses the same detection threshold for all the file lists (or so I think, since at 20% it stacks almost all the 4 minutes, but at 6-7% it only stacks one of the 30 second frames). And fyi, when stacking only the 30 second frames, there is no problem making an image. Stacking only the 4 minute subs also shows no problems. Let me know any ways you can think of to resolve this. I appreciate it!

You can try using the entropy weighted average stacking method and also add the different iso and exposure subs to a new group.

When you add the all the 4 min lights,  right next next to the main group tab( in the bottom) will be another tab named group 1, click on it and add the 30 seconds lights and other respective calibration files there. 

Hth

 

[alacant]

Hi. I think that having your 30s exposure in the main group and the 4 minute in group 1 will do it. Set the star%. It just means that your 4 minute exposures will have more stars detected. HTH.