Too much red/pink?

Jon Pither

Hi,

Here's an image of the Ghost Nebula. This image seems to have a real red/pink funk going on, even after SCC. This is the starless image. I've just done a first GHS on it, no other processing (aside from BlurX on the R G B).

I'm a bit lost on how to proceed, given the amount of red going on... Any guidance / thoughts would be appreciated,

Jon.

Jon Pither

I've realised my error. Putting "Ghost Nebula" into NINA, and not checking that the target is the right target. This is IC-59, for which my image is much closer to in terms of colours.

Not going mad!

BlockHead

Indeed...I was going to say... what the $%^! are you talking about. (And did you see *my* old image of the same?  (https://www.astrobin.com/g4oe2p/?nc=&nce=)

-the Blockhead

Jon Pither

I'm pretty happy with this Cassopia's ghost (who's ghost is it anyway?). Feedback welcome!

The main star was so bright, it caused some surrounding artefacts in the L image. Therefore I cropped it out the final image.

If you've any thoughts on the artefact that could help, I've attached this stretched / cropped image of the star - see the artefact on the top right? This plays havoc when I do a star-extract and then stretch etc. Wonder what it is? Is only present on luminence.

thanks.

BlockHead

You need to say what telescope you are using.

If there is an asymmetric artifact as shown here..it should be connected to something in the light path at the front of the telescope. For reflectors this is often a cable that is sticking out from a secondary mirror support vane. For a refractor... sometimes the mirror clips are an issue. You can take pictures with your hand in front of the telescope to get the position of the offending thing in your light path and figure out what it likely is.

-the Blockhead

Jon Pither

Hi Adam,

Thanks.

Scope is a 120 William Optics FLT refractor.

This is a single L sub - 300 secs. It's look weird around the star. I will endeavor to see if there's anything interrupting the scope's view. It is now at a remote observatory however.

BlockHead

There is definitely something in the light path causing that scatter. There may need to be an edge of the optic or something that needs to be blackened.

-the Blockhead

Jon Pither

Thanks. Will see what I can do with the equipment.

I've done a final pass of this, and managed to get the star in. I used GAME and Convolution on the L starless image, prior to LRGB combination.

https://www.astrobin.com/19xbzb/B/