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The Double Cluster in LRGB

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#1 AXAF

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Posted 27 September 2020 - 11:57 AM

Here's my LRGB rendition of the Double Cluster. Imaged from a red zone.

 

The details are:

 

Equipment

 

Telescope: StellarVue SVQ-100 APO

Camera: ZWO 183MM Pro cooled to -20 C, gain of 50, offset of 0.

Filters: Astrodon LRGB Gen 2 E-series Tru-Balance filter set.

Mount: iOptron iEQ45 Pro guided with PHD2 to 1.2 arc-sec.

 

Acquisition S/W: Image acquistion controlled through Voyager Astrophotography Automation software.

 

Images:

All exposures were of 300s duration.

Luminance: 48 frames

Red: 37 frames

Green: 37 Frames

Blue: 36 Frames

 

Processing: Processed in PixInsight, including EZ Processing Suite to reduce the background stars.

 

Thanks for lookin'.

 

-Gary

 

Attached Thumbnails

  • DoubleCluster_Small.jpg

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#2 bobzeq25

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Posted 27 September 2020 - 12:31 PM

Great image.

 

Minor point.  In a red zone, 183 camera, F6, gain 50, you use 300s subs?  The equivalent to what I use in my red zone, would be maybe 40 for the L.  This table would recommend 20 for the L (a bit less, it's more orange zone). 

 

About 3X for the RGB.

 

https://www.cloudyni...olour-versions/

 

You'd saturate fewer stars, get better star color.  Have to deal with a lot more subs for the same total imaging time.

 

The very low read noise CMOS are a different animal than CCDs.


Edited by bobzeq25, 27 September 2020 - 12:37 PM.


#3 AXAF

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Posted 27 September 2020 - 01:19 PM

Great image.

 

Minor point.  In a red zone, 183 camera, F6, gain 50, you use 300s subs?  The equivalent to what I use in my red zone, would be maybe 40 for the L.  This table would recommend 20 for the L (a bit less, it's more orange zone). 

 

About 3X for the RGB.

 

https://www.cloudyni...olour-versions/

 

You'd saturate fewer stars, get better star color.  Have to deal with a lot more subs for the same total imaging time.

 

The very low read noise CMOS are a different animal than CCDs.

Thanks for the excellent advice. I'll make the suggested adjustments and try another run.

Definitely wanted to avoid saturating the brighter stars.
 



#4 AXAF

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Posted 27 September 2020 - 08:48 PM

Here is the RGB version. Again, star reduction achieved through EZ Processing Suite.

Slight curves adjustment to bring up the color saturation slightly.

Attached Thumbnails

  • DoubleCluster_RGB_small.jpg

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#5 sunnyday

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Posted 27 September 2020 - 08:52 PM

I can't wait to see it, nice photo, thank you .



#6 Cooperbrad

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Posted 27 September 2020 - 08:57 PM

The image is gorgeous. This is why I am into astrophotography. To be able to capture this and then show everyone I can. :)


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#7 GA-HAMAL

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Posted 28 September 2020 - 12:55 AM

Nice soft imaging, it feels like these stars really shine :smile:


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