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North American & Pelican - Askar FRA400 and L-Enhance

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#1 Poochpa

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Posted 05 August 2021 - 12:39 PM

Here's the North American (NGC 7000) and Pelican (IC 5070) nebulae, imaged under Bortle 6 skies with the moon up for the first hour of imaging. Since I was using a dual-band pass filter, I processed the data both as an RGB image and as a narrow-band image.

 

    Scope: Askar FRA-400 with .8x reducer, FL 280mm
    Camera: ZWO ASI2600MC-P with Optolong L-Enhance filter
    Mount: Rainbow Astro RST-135
    Exposures: 49x120s, gain 100

 

Mike

 

RGB image:

https://www.cloudyni...5658_328848.jpg

 

NB image:

https://www.cloudyni..._5658_29970.jpg


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#2 Sky King

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Posted 05 August 2021 - 01:06 PM

I imaged the North American the other night and I can see now that I only got the left side of it!  Plus you brought out much more detail and swirls, dust, etc. (I wasn't using a filter either.) So basically you have raised the bar quite a bit! Thanks for posting these, they are inspiring and very well done! 



#3 kvastronomer

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Posted 05 August 2021 - 03:12 PM

Here's the North American (NGC 7000) and Pelican (IC 5070) nebulae, imaged under Bortle 6 skies with the moon up for the first hour of imaging. Since I was using a dual-band pass filter, I processed the data both as an RGB image and as a narrow-band image.

 

    Scope: Askar FRA-400 with .8x reducer, FL 280mm
    Camera: ZWO ASI2600MC-P with Optolong L-Enhance filter
    Mount: Rainbow Astro RST-135
    Exposures: 49x120s, gain 100

 

Mike

 

RGB image:

https://www.cloudyni...5658_328848.jpg

 

NB image:

https://www.cloudyni..._5658_29970.jpg

How did you map RGB colors for NB version?



#4 cucubits

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Posted 05 August 2021 - 03:39 PM

Very nice results. I'm eyeing the 2600MC for a while now...

 

If you don't mind, what's your RGB processing workflow with the L-Enhance? Do you still split the channels and recombine?



#5 mackiedlm

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Posted 05 August 2021 - 04:07 PM

Those are both fantastic images. I too would be interested in your workflow. I've done a reasonable HOO of a similar field with a dslr but the colours were nowhere near as striking as yours.

#6 Poochpa

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Posted 06 August 2021 - 11:48 AM

Thanks everyone for the comments. I use PixInsight for image processing. Concerning my workflow with the L-Enhance filter, I first process the image to completion as a standard RGB image. I do not split the channels for RGB processing and I do not use any narrow band settings, as the L-Enhance filter is not a NB filter. So, for example, for color calibration using PCC, I use the broadband setting as working mode. My typical workflow after stacking is:
Crop to remove stacking artifacts
ABE or DBE
PCC
SCNR
MLTNR
HT, or a blend of HT/MS
CT for contrast
Saturation using CT with a masked background

 

For the NB image, I use the finished RGB image. It seems to work better in terms of NB color than what I previously did, which was to use the RGB image immediately after taking it nonlinear. I first use Starnet to remove the stars; the stars image to be processed separately later. For the starless image, I split the channels, deleting the B channel.  I use HT and/or CT to approximately match the G channel’s brightness to that of the R channel. For channel mapping, I leave R as R, G as G and map a blend of R and G to B,  usually 50-50, sometimes more R.  I then recombine the channels and use CT’s individual channel curves to get the look I want, followed by an RGB saturation curve. The stars only image is only slightly processed, using SCNR and a little saturation increase. I then recombine with the starless image using PM.

 

Mike


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#7 PhotonHunter1

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Posted 06 August 2021 - 05:28 PM

Absolutely love the NB image. I am seriously considering buying this scope to give me a wider FOV than my current ES102 apo triplet - and your image may have just pushed me over the finish line.  Thanks for sharing.



#8 GaryO

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Posted 06 August 2021 - 08:04 PM

Mike, this is a wonderful image! I first looked at it and thought what a great SHO Hubble Palette acquisition and process. Then I saw this was with an OSC camera with one filter! Great job....

 

Gary




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