Caldwell 33 in SHO

[paul]

Added data so now have about 12hrs of subs which is record for me (with the slight problem that unstretched image looks almost processed 😄). There's some finer detail with better contrast now.

 

I tried using starnet to remove the stars and process the gas but that resulted in mushy gas. Instead I used the starnet star-mask applied to the original image to tone them down a bit in the final stretches.

 

I'm still messing with my processes, now using ez-denoise (which was an excellent tip - thanks Bryan) in the first phase and convolution in the final stages.

I would appreciate comment and criticism, you never stop learning.

 

Edited September 7, 2021 by paul

[AstronomyUkraine]

8 minutes ago, paul said:

Added data so now have about 12hrs of subs which is record for me (with the slight problem that unstretched image looks almost processed 😄). There's some finer detail with better contrast now.

 

I tried using starnet to remove the stars and process the gas but that resulted in mushy gas. Instead I used the starnet star-mask applied to the original image to tone them down a bit in the final stretches.

 

I'm still messing with my processes, now using ez-denoise (which was an excellent tip - thanks Bryan) in the first phase and convolution in the final stages.

I would appreciate comment and criticism, you never stop learning.

 

It looks great, although the bright green is not to my taste. Is this an OSC image, or did you use your 1600?

[paul]

2 minutes ago, AstronomyUkraine said:

It looks great, although the bright green is not to my taste. Is this an OSC image, or did you use your 1600?

🤢 Yes it is! Yes, using the 1600, Its mixed as SHO so I cant see how to avoid the green I have tried a few other combinations but they all look pretty psychedelic. 

 

I just did an arbitrary SCNR set at 0.7 and this is the result which is  easier on the eye but the hydrogen as lost a bit of impact.

[AstronomyUkraine]

 

9 minutes ago, paul said:

🤢 Yes it is! Yes, using the 1600, Its mixed as SHO so I cant see how to avoid the green I have tried a few other combinations but they all look pretty psychedelic. 

 

I just did an arbitrary SCNR set at 0.7 and this is the result which is  easier on the eye but the hydrogen as lost a bit of impact.

A normal combination for this object is to use just Ha and OIII in a HOO combination. The HOO comes out like this.

 

Edited September 7, 2021 by AstronomyUkraine

[paul]

I see most images of the veil are HOO but there is a significant sulphur signal I wanted to try and bring out, I'll do a bit more research. 

A hires version is here.

Edited September 7, 2021 by paul

[AstronomyUkraine]

1 minute ago, paul said:

I see most images of the veil are HOO but there is a significant sulphur signal I wanted to try and bring out, I'll do a bit more research. 

 

You could try mixing the SII and Ha in the red channel in PixelMath. Something along the lines of SII*.7+Ha*.3

[Dmack1]

Thats a nice image but I'm with Brian re - the Green. But you are right that it does show the Sii much better.

[MarkAR]

Very nice, keep experimenting to see what brings out the best.