DSS is eating my stars !!!

[jjjnettie]

I captured this data this evening.
15x5min @iso800 using my Canon 550D and Nifty 50 lens.
All the individual subs are great, but when I stacked them, DSS ate most of the stars at the bottom.
I'd not made any changes to the settings at all since the last time I used it.
Can any explain what has happened?

[RickS]

Vogons? :lol:

Sorry JJJ, I don't have a sensible explanation. I've never tried DSS.

[gasman1]

Flip top to bottom the images and then stack, then see if the bottom area is still smudged. This could be a hardware failure: do an extensive memory and hardware diagnostic. The personal computers today don't do error checking and correction like the cluster workstations do, so a failure goes undetected unless it causes a problem. Also make sure that one of your images isn't corrupted as that will spoil the stack also.

[jjjnettie]

I think I have the problem sorted. Just waiting for the stacking to finish to confirm.

[jjjnettie]

:) OK Problem solved. I changed my star detection thresh hold in DSS up to 93% so there weren't as many stars for it to have to count.
Image specs.
canon 550D @ ISO 800 Canon Nifty Fifty F1.8 @ F4.5.
13 x 5min subs.

[ourkind]

Phew that was lucky! Something else to keep in mind now when stacking :) beautful shot too :thumbsup:

[tlgerdes]

That was the answer I was going to say. Had that problem a couple of years ago with DSS.

[jjjnettie]

Damn you DSS, it's doing it again. Talk about touchy settings. :(
At least I know it can be fixed. But I'm onto my 4th try of restacking. It better be worth it. :(

[pluto]

When you hit register, go to the Advanced tab and hit the "Compute the number of detected stars" button. Then adjust and re-compute until it finds between 50-100 stars. Those numbers have always worked for me on widefields.