Pleiades processing issues

[AstroJay]

Hi,

I'm having real issues pulling out any nebulosity from my stack - total exposure 2hrs 53mins, iso 400 (anything higher just seemed to give me fully white images), exposures of 90s. Any tips/advice?

Thanks!

Jay

Pleiades no procesing.tif

[alacant]

Hi

There's something of nebulosity around the stars of the cluster but also maybe haze, cloud or walking noise over the whole frame. The background is going to be difficult so just to answer your question... Don't know what you're using to process but if by conventional means, go a bit at a time with the centre slider.

HTH

Edited December 10, 2019 by alacant

[vlaiv]

I think you need to re stack your data, but pay attention to remove offending frames.

It looks like there were some thin clouds at some point that messed up image, here is green channel (cleaned from gradients and stretched a bit):

It clearly shows tacking artifacts and high level clouds. Stacking artifacts are there because of high level clouds (lines on alignment seams - these are due to uneven background as clouds shift between subs).

Nebulosity is there but its about the same brightness as cloud reflection from LP or maybe even less and that prevents you from showing it. Hopefully you will manage to find enough cloud free subs to stack and results should be better then.

[Craney]

Could be worse.....   I tried to extract a bit of nebulosity from one of my own recent shots and got this.....   

Edited December 10, 2019 by Craney

[rickwayne]

Worse? Man, that is ART!!

No, seriously, I know that's not at all what you wanted but it's a super-cool effect!

Oh jeez, now I'm hijacking this to one of those threads that are all "You think that's a screwup? Pah! THIS is a screwup!", aren't I?

So be it.

[Craney]

Lucy in the Sky with Diamonds .....................   hey !!!!

[lenscap]

23 hours ago, Craney said:

Could be worse.....   I tried to extract a bit of nebulosity from one of my own recent shots and got this.....   

 

Fantastic!

Your processing has revealed how stars warp the fabric of Spacetime;  a Nobel Prize awaits  😊