Deep Sky Stacker stacking problem

[Oisinmcc16]

Hi all,

Would anyone be able to explain why dss is only counting 4 stars in this image when there's clearly more.

Could be because I forgot to take the files as RAW rather than as JPEG.

 

Thanks,

Oisin

[wxsatuser]

Most likely because the stars are not round, your stars are slightly elongated, corner ones have coma.

DSS needs to find at least 8 good stars common to each of the frames.

[bottletopburly]

You may need to alter the number of stars it sees in settings there is a slider you move you want about 150 ish move slider to suit .

[Oisinmcc16]

On 23/11/2020 at 05:19, wxsatuser said:

Most likely because the stars are not round, your stars are slightly elongated, corner ones have coma.

DSS needs to find at least 8 good stars common to each of the frames.

Thanks for the reply, is there any way I can account for the coma, and I assume that the stars being elongated is due to a too long exposure time.

[happy-kat]

Hi

What did you use to image with?

You can manually select the stars in your images in

DSS if you can't get your stats recognised automatically.

 

[almcl]

I don't think your stars are that bad. 

Not sure what your star detection threshold is set at but when I put your jpeg though DSS with a threshold setting of 32, it finds 85 stars which is more than enough for stacking.

 

The trees may present more of a problem though.

[toxic]

that is way to high you need to have it around 10% the lower  the more stars it detects

 

[happy-kat]

If there is static foreground in your images you might like trying stacking using sequator if you want to make the foreground a feature of your image 

[davew]

Having done similar stuff myself and finding DSS doesn't like a quarter of the stars missing due to trees then I'd do what happy-kat suggests. One thing of note though, Sequator only works under Windows but not only is it very accurate it's also lightening fast.

Other than that then you can still use Sequator on a full starry image or follow the clues left by the others re the DSS problems you have.

Dave.

Edited November 25, 2020 by davew