Author Topic: DSS not stacking Ha subs  (Read 60 times)

0 Members and 1 Guest are viewing this topic.

Apophis

  • O. A. S.
  • Cluster Class
  • *
  • Posts: 830
  • intermediate Mono Cmoser
    • image book
DSS not stacking Ha subs
« on: Apr 07, 2019, 18:32:14 »
Lucky if i can get one to stack as stars are too small for DSS to detect even on lowest setting of 2, anyone know of software that can handle them better?
Roger
Watch the skies.................

Carole

  • O. A. S.
  • Galaxy Cluster
  • *
  • Posts: 7899
    • Carole's images
Re: DSS not stacking Ha subs
« Reply #1 on: Apr 07, 2019, 19:41:27 »
How have you managed with Ha so far?  Has DSS been OK with other targets?

I use Astroart, but it's not free.  Never had a problem stacking with that.  DSS does seem much more sensitive to the the star threshold, had problems with it myself in the past.

I don't know of anything else that is free for stacking except Iris, but not easy to use.

Carole
« Last Edit: Apr 07, 2019, 20:23:33 by Carole »

The Thing

  • Mr October
  • O. A. S.
  • Galaxy Class
  • *
  • Posts: 2702
  • The OAS International Branch
Re: DSS not stacking Ha subs
« Reply #2 on: Apr 07, 2019, 21:03:31 »
I assume you are using the latest version. Try turning  off the median filtering on the star detection threshold if the stars are very small as they are probably being filtered out. Also hot pixel detection if its checked anywhere may cause problems with very small stars. I would think that a higher % would be needed, when I get very sharp focus and so pointy stars I find I often need 60-80 % to get the star count down to around 100 (which is way more that you need, 8 is enough).
Are they mono subs? Make sure the debayer settings are correct and no background calibration is active (I never use it as it messes with colour data). Try stacking a straight average, it may be that the sigma stacking is wiping out the tiny stars if they are very dim due to the Ha filter.

HTH

Duncan

Apophis

  • O. A. S.
  • Cluster Class
  • *
  • Posts: 830
  • intermediate Mono Cmoser
    • image book
Re: DSS not stacking Ha subs
« Reply #3 on: Apr 08, 2019, 15:20:13 »
will try , thanks Duncan,
Roger
Watch the skies.................