Hemisphere:  Northern  ·  Constellation: Hercules (Her)  ·  Contains:  Hercules Globular Cluster  ·  IC 4613  ·  IC 4614  ·  IC 4615  ·  IC 4616  ·  IC 4617  ·  M 13  ·  NGC 6196  ·  NGC 6197  ·  NGC 6205  ·  NGC 6207
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M 13 Hercules Cluster (0.5mm T-2 distance ring test), 



    
        

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M 13 Hercules Cluster (0.5mm T-2 distance ring test)

Getting plate-solving status, please wait...
M 13 Hercules Cluster (0.5mm T-2 distance ring test), 



    
        

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Powered byPixInsight

M 13 Hercules Cluster (0.5mm T-2 distance ring test)

Equipment

Imaging Telescopes Or Lenses
Sky Watcher Explorer 130PDS
Imaging Cameras
Canon EOS 70Da
Mounts
iOptron GEM28
Filters
Astronomik UV-IR Block L-3 Clip Filter
Accessories
Lacerta LED Flatfield-Box 185mm · Baader MPCC Mark 3
Software
Pleiades Astrophoto PixInsight · Adobe Lightroom 6 (Adobe Lightroom)
Guiding Telescopes Or Lenses
TS-Optics Deluxe 50 mm Guiding/Finder scope with micro focusing
Guiding Cameras
Lacerta MGEN 2

Acquisition details

Dates:
May 1, 2022
Frames:
Astronomik UV-IR Block L-3 Clip Filter: 112x90" (2h 48') ISO1600 f/5
Integration:
2h 48'
Darks:
34
Flats:
59
Bias:
38
Avg. Moon age:
0.60 days
Avg. Moon phase:
0.41%
Bortle Dark-Sky Scale:
5.00
Temperature:
10.00

RA center: 16h41m41s.88

DEC center: +36°2617.5

Pixel scale: 1.292 arcsec/pixel

Orientation: -0.499 degrees

Field radius: 1.120 degrees

WCS transformation: thin plate spline

More info:Open 

Resolution: 5193x3467

Locations: Derendingen 454m, Solothurn, SO, Switzerland

Data source: Backyard

Description

For this test I used a T-2 fine adjustment ring (0.5mm) to extend slightly the distance between DSLR sensor and corrector (measured distance about 54mm without any ring). The stars in the corners look much better than before, but there is still room for improvement. Next time I'll use the 1mm distance ring!

Additional I encountered for the first time some light reflections. I’m not sure about the source. There is no bright star outside the field of view in that direction… I’m a bit confused about this…

Maybe it’s time to darken the tube inside...

Comments

Revisions

  • M 13 Hercules Cluster (0.5mm T-2 distance ring test), 



    
        

            star-watcher.ch
    Original
  • M 13 Hercules Cluster (0.5mm T-2 distance ring test), 



    
        

            star-watcher.ch
    B
  • Final
    M 13 Hercules Cluster (0.5mm T-2 distance ring test), 



    
        

            star-watcher.ch
    C

B

Description: Tried to remove the reflection

Uploaded: ...

C

Description: NoiseXTerminator

Uploaded: ...

Sky plot

Sky plot

Histogram

M 13 Hercules Cluster (0.5mm T-2 distance ring test), 



    
        

            star-watcher.ch