More than one Halo around Alnitak!

[emyliano2000]

Hi guys!

A few night ago I had the chance to shoot one of my favorite DSOs, The Horsehead and companions.

I took 24x300sec exposures and when I stacked them I noticed that I have more than one halo around Alnitak.

I used my TS65 quad with the Canon 700D and IDAS LPS D1 clip in filter.

Is it possible that one of the lens elements inside the telescope to be a bit loose and move inside when the telescope moves?

The clip in filter sits quite tight inside the camera, I made sure of it.

I managed to remove the effect with the Healing tool brush in Photoshop but if there is a problem I would really like to know what it is if somebody has a clue.

Thanks.

Emil

[jjosefsen]

Is it also there in a single exposure?

[emyliano2000]

22 hours ago, jjosefsen said:

Is it also there in a single exposure?

No it isn't.

[happy-kat]

Are you removing hot pixels in DSS ? Try a stack without.

[jjosefsen]

11 minutes ago, emyliano2000 said:

No it isn't.

Then is it not some kind of stacking artifact instead of a problem with the optics?