Hemisphere:  Northern  ·  Constellation: Coma Berenices (Com)  ·  Contains:  NGC 4565  ·  NGC 4631  ·  Needle Galaxy  ·  The star 12Com  ·  The star 13Com  ·  The star 14Com  ·  The star 16Com  ·  The star 17Com  ·  The star 18Com  ·  The star 23Com  ·  The star 26Com  ·  The star 7Com  ·  The star γCom  ·  Whale Galaxy
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The Coma Star Cluster, 



    
        

            William Maxwell
The Coma Star Cluster
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The Coma Star Cluster

Getting plate-solving status, please wait...
The Coma Star Cluster, 



    
        

            William Maxwell
The Coma Star Cluster
Powered byPixInsight

The Coma Star Cluster

Technical card

Imaging telescopes or lenses: Takumar 135mm F/3.5

Imaging cameras: Canon 5D

Mounts: Vixen Polaris

Software: Astro Pixel Processor  ·  Adobe Photoshop CS4 Photoshop CS4

Filters: Orion SkyGlow Imaging Filter

Accessory: OnStep GoTo Controller


Dates:May 4, 2021

Frames:Orion SkyGlow Imaging Filter: 142x30" (1h 11') ISO800 (gain: 0.00)

Integration: 1h 11'

Darks: ~50

Bias: ~100

Avg. Moon age: 22.81 days

Avg. Moon phase: 42.94%


Basic astrometry details

Astrometry.net job: 4474226

RA center: 12h 23' 59"

DEC center: +27° 3' 28"

Pixel scale: 12.466 arcsec/pixel

Orientation: 179.692 degrees

Field radius: 8.912 degrees


Resolution: 2911x4246

Data source: Backyard

Description

I'm a big fan of larger sensors, but they tend to cost a zillion dollars. For years I didn't use my Canon 5D (classic) due to amp glow, then I remembered dark frames..which cured the problem. The older 5D doesn't have the pixel count, but the larger pixels really improved the dynamic range (the lower 800 iso helped) keeping much of the star color.

So here is my first go with a full frame. I'm hoping it will be a nice plus to the 135mm fl wider field shots, rather like using a wide field eyepiece that still has a fair amount of zoom.

Speaking of the 135mm lens. I must say I'm rather impressed with the resolution. The stars remained pinpoints all the way to the edge with the full frame sensor even with the lens wide open.

I also debuted my Onstep build for this setup. It was a steep learning curve and I am still by no means an electronics person, but once I got a formula worked out (with generous help from the forum) I just kept building the things. Pretty much all my mounts now have GoTo which in this case is really good since finding motors for these older Polaris mounts is nearly impossible.

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The Coma Star Cluster, 



    
        

            William Maxwell

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