DSS Problem - Only one frame is stacked

MarZ
28 Apr, 2018 09:11
Hi everyone!

I have a little problem with DSS. Yesterday i made 8 light frames from M13. 2s exposure,ISO 3200, no tracking, 700mm focal length. But DSS olny stack one frame out of 8.
Can someone tell me, where is the problem?
Single frame(very noisy, becouse i needed to convert ti jpg from CR2) : 
carastro
29 Apr, 2018 13:05
Common problem with DSS.  It is likely it will only stack 1 frame because it is not seeing enough stars to register the images.

You can try lowering your star threshold in Register checked pictures/advance tab and see what happens.  It is likely since your exposures are so short it is not showing up the stars enough for DSS to recognise them.

Failing that you might need to stretch the individual exposures to make the stars more visible before trying to stack them.  This is not ideal or the right way to do it, but it might help to diagnose your problem.

Carole
Edited 29 Apr, 2018 14:43
MarZ
29 Apr, 2018 13:40
I tried it, but didn't helped.

Can it be the problem, that the picture is too noisy?
But i don't know why.. only ISO 3200, with 2s exp…
ruccdu
29 Apr, 2018 16:42
This may not help, but don't convert to JPG format.  If you have to convert the CR2 files, convert them to 16-bit TIF format.  If nothing else, yuo'll be in better shape to do a prestretch as Carole suggests.

Alternatively, you can download the new 64-bit (there is also a new 32-bit) version of DSS.  I couldn't stack CR2 files with the older version, but now I can with the 64-bit version.

Ron
MarZ
06 May, 2018 11:04
Okay, I will try, and thanks!

But, can it be a problem, that i dont use tracking, so the target is moving, and have different position on every frame?
SDB777
06 May, 2018 21:07
Which version of DSS are you using? I can stack CR2 files in my 3.3.4 version…

As already stated, don't make them into jpeg…..
Scott
ruccdu
07 May, 2018 15:29
MarZ, I've heard that DSS can have trouble identifying stars if they are not round enough.  So that might be what is happening, especially if you are not guiding.

Scott, My understanding is that as new models of cameras are sold, a support file needs updating.  When folks have had trouble stacking, once they updated the software, the problem went away.  Recently, the support for new cameras was dropped, but with the new versions of DSS, a new support file is being used and new cameras are again supported.  I recently obtained a new Canon whose image files were not supported by DSS.  Once I downloaded the new version, the images opened.

Ron
carastro
07 May, 2018 21:55
MarZ
Okay, I will try, and thanks!But, can it be a problem, that i dont use tracking, so the target is moving, and have different position on every frame?

Provided the stars are not too mis-shapen that is what stacking software will do, move the frames so they sit on top of each other in the right position.

Carole
quinti
07 Jun, 2018 20:18
hi there,

you may use fitswork instead. Its not as easy as dss but it can align your pics if you can see 2 stars.
khrrugh
08 Jun, 2018 07:48
Another option is to use SIRIL for stacking. It is capable of stacking with several methods and does a god job there. Due to its complexity i only use it when DSS has a problem with stacking.
carastro
08 Jun, 2018 09:09
Just looked back to your original post, you say you were doing 2s images.  Presume this is 2secs.  I think it could just be that the exposures are too short for the stars to show up very much.

Carole
jeffbax
08 Jun, 2018 10:17
Hello. The frames must have the same dimensions to stack. Check this point.

Regards.

JF
khrrugh
08 Jun, 2018 10:43
Carastro
I think it could just be that the exposures are too short for the stars to show up very much.

Whenever i am doing short exposures i have the same problem with DSS-stacking like MarZ. Then SIRIL will do the job.
 
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