Ummm, somethings not quite right here.

[hobsey]

Despite the full moon last night, I was itching to try out the Star Adventurer which I've had a while now.

Took a few different exposures just to try it out.

Loaded them up in Deep Sky Stacker and these are the results.

Fine on the left hand side but as you can see, from the centre to the right it's all gone horribly wrong.

Any ideas?

[Owmuchonomy]

Well I see a similar effect although admittedly only in a small part of my tiff file. For me it is down to an idiosyncracy within DSS associated with my flat frames. The work around I used was to stack my lights, darks and bias first then re-stack again but this time include my flats and it got rid of it. I don't know the root cause but my work around has helped others on SGL.

[hobsey]

I think I know what you mean.

These are only lights to try out the mount, will doing darks etc help with the stacking?

[Uranium235]

Load an individual sub and process it, see if it has the same distortions. It shouldnt look like that whether you are using calibration frames or not, something has bent the image.

[Chris]

I know that the previous version of DSS doesn't like Canon 1100D's for some reason, it only stacks the centre of the image for me? I loaded the latest version (3.3.4) and the problem went away. Might be worth a try if you don't have the latest version? 

[hobsey]

Damn, going to have to try it some other time as I've lost the files.

May try and give the mount another go tonight.

[hobsey]

I know that the previous version of DSS doesn't like Canon 1100D's for some reason, it only stacks the centre of the image for me? I loaded the latest version (3.3.4) and the problem went away. Might be worth a try if you don't have the latest version? 

This is the latest (3.3.4) as I had the thin strip processing also first time round.

[hobsey]

This is the stack file from the older version of DSS, no bending.

[Chris]

ok yep, different problem then?? 

Fingers crossed it might be a one off.

[Knight of Clear Skies]

What lens were you using please? Also, was DSS set to stack in intersection or mosaic mode?

Have you tried looking at the individual subs? I'm wondering if part of the lens could have misted up during the run.

[laser_jock99]

Try reducing the star threshold to select fewer stars. Having to high a threshold sometimes fools DSS into thinking hot pixels and noise are stars resulting strange distortions of the real stars as it tries to register all the point sources.

[hobsey]

Thanks for the suggestion guys, will have to try it again once I've done another run.

Lens was a nifty and can't remember what setting it was on but it definitely wasn't on mosaic.

[Davey-T]

Are you going to try it tonight Anthony ? been waiting to see how you got on, on the verge of getting mine replaced.

Could you have had dew on the lens or side glare from the Moon ?

Dave

[hobsey]

No, as much as I want but too tired from work and I think I will wait until there is less moon.