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Leo "Doublet" (M65 & M66) in color with TEC 160FL

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#1 Peter in Reno

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Posted 25 April 2019 - 12:57 PM

This is a sequel to my previous thread about my first light with TEC 160FL but only in Luminance.

 

I finally capture color images taken with my almost new TEC 160FL. RGB was blended with Luminance taken two days ago. The FOV was too small to include the Hamburger galaxy so I opted for M65 and M66. The seeing condition was not good and the background looked a little "dirty" so it was not easy processing "dirty" background. Looks like there's no blue star bloats from TEC 160FL which contains fluorite glass but TEC Field Flattener was also used and could also help deal with blue star bloats as well.

 

High resolution image available at: https://peternagy.sm...ies/i-kXGTxHz/A

 

Leo Doublet (M65 & M66) . RGB + Luminance. 0.84"/pixel image scale.

 

Astrodon I series Red filter, 12 x 5 minutes, 1x1. 4/24/2019.
Astrodon I series Green filter, 12 x 5 minutes, 1x1. 4/24/2019.
Astrodon I series Blue filter, 12 x 5 minutes, 1x1. 4/24/2019.
Astrodon I series Lum filter, 36x 5 minutes, 1x1. 4/22/2019.

 

Total 6 hours.

 

TEC 160 APO F/7 with TEC Field Flattener, Astro-Physics A-P1100GTO GEM with absolute encoders. QSI660wsg. OAG and Ultrastar autoguider (1.19"/sec), Optec Handy Stepper Motor focuser.

 

Captured and automated with SGP. Calibration and Post-processed with PixInsight. PHD2 settings: RA Aggressiveness: 60, RA Hysteresis: 10, Max RA/Dec Duration: 2000, Min Move: 0.67 (0.80"), Calibration Steps: 200msec, Auto/Resist Switching, Auto guiding exposure and extreme dithering.

 

Peter

 

Leo_Doublet_Compressed.jpg


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#2 bmhjr

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Posted 25 April 2019 - 01:51 PM

Looks nice Peter.  Great to see that the flourite design and your configuration is not showing ill affects in the blue channel.  I have been looking for RGB images with the new TEC scopes but have not been able to find many.  Thanks for posting.

 

Bill



#3 Peter in Reno

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Posted 25 April 2019 - 01:59 PM

Search for "160FL" at astrobin.com . There are quite a few images taken with TEC 160FL and some images using same camera as mine.

 

Peter 


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#4 bmhjr

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Posted 25 April 2019 - 02:06 PM

Search for "160FL" at astrobin.com . There are quite a few images taken with TEC 160FL and some images using same camera as mine.

 

Peter 

Thanks, I had been searching 140FL laugh.gif .   But should be similar.



#5 Peter in Reno

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Posted 28 April 2019 - 10:09 PM

For those interested in processing my Leo "Doublet" images, here are the links:

 

Master Lum: https://www.dropbox....ation.xisf?dl=0

Master Red: https://www.dropbox....ation.xisf?dl=0

Master Green: https://www.dropbox....ation.xisf?dl=0

Master Blue: https://www.dropbox....ation.xisf?dl=0

 

Feel free to process my images and display your results here. Sorry, the files are in *.xisf which requires PixInsight software to process.

 

Thanks,

Peter


Edited by Peter in Reno, 28 April 2019 - 10:29 PM.


#6 Peter in Reno

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Posted 29 April 2019 - 12:07 AM

Here are the 16 bit unisgned FIT files for those who do not have PixInsight software:

 

Master Lum: https://www.dropbox....ration.fit?dl=0

Master Red: https://www.dropbox....ration.fit?dl=0

Master Green: https://www.dropbox....ration.fit?dl=0

Master Blue: https://www.dropbox....ration.fit?dl=0

 

Thanks,

Peter



#7 Peter in Reno

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Posted 29 April 2019 - 11:48 AM

This is a reprocess of Leo "Doublet". The original process used Photo Metric Color Calibration and ArcSinh Stretch.

 

The new process used Background Neutralization, Color Calibration and Histogram Transformation and I believe the colors look more correct than my original process. Also the stars look better using Histogram Transformation than ArcSinh Stretch.

 

Lately I have stopped using any kind of noise reductions because it makes the images look too soft especially the stars. Also, I have been questioning Photo Metric Color Calibration because sometimes the results look a little too artificial.

 

So I reverted back to using Background Neutralization, Color Calibration and Histogram Transformation in place of PCC and ArcSinh Stretch.

 

Thanks,

Peter

 

Here is a re-process image of Leo "Doublet". Higher resolution image at: https://peternagy.sm...ies/i-6LpdjvC/A . Blink in between this image and the next image by clicking on right and left arrows back and forth.

 

Leo_Doublet_BNCC_HT_Compressed.jpg


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