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Contains:  Extremely wide field
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California Nebula - Nikon 180mm f/2.8 ED first light, 





    
        

            georgian82
California Nebula - Nikon 180mm f/2.8 ED first light

California Nebula - Nikon 180mm f/2.8 ED first light

Technical card

Resolution: 8510x6294

Dates:Nov. 22, 2016

Frames: 85x180"

Integration: 4.2 hours

Avg. Moon age: 23.22 days

Avg. Moon phase: 38.74%

Astrometry.net job: 1401538

RA center: 60.044 degrees

DEC center: 36.390 degrees

Pixel scale: 2.116 arcsec/pixel

Orientation: 90.816 degrees

Field radius: 3.111 degrees

Description

This is the first light of the Nikon 180mm f/2.8 ED lens. I used it wide open at f/2.8 to collect more photons but the lens wide open is not very sharp and shows a significant amount of CA.

This image is composed of 85 x 3-minutes exposures at f/2.8 and ISO 800, all unguided on Astrotrac. The camera is used inside a thermoelectric cooling box and the sensor temperature was between 25F and 30F during the imaging sessions (20-25F below ambient temperature).

This image is slightly cropped and it represents the real field of view with my camera sensor. It was also drizzled in PixInsight to increase the pixel size.

Comments

Author

georgian82
georgian82
License: None (All rights reserved)
2500
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Revisions

  • California Nebula - Nikon 180mm f/2.8 ED first light, 





    
        

            georgian82
    Original
  • California Nebula - Nikon 180mm f/2.8 ED first light, 





    
        

            georgian82
    B
  • California Nebula - Nikon 180mm f/2.8 ED first light, 





    
        

            georgian82
    C
  • Final
    California Nebula - Nikon 180mm f/2.8 ED first light, 





    
        

            georgian82
    D

B

Updated version. Still working on it...

C

I added another 20 light frames in order to bring out some of the nebulosity surrounding the California Nebula. I processed it differently from version A and B in that I stretched the image a lot to bring out the data. Now I need to work on noise reduction.

D

I increased the dynamic range and applied some noise reduction. I am considering decreasing the amount of stars present.

Sky plot

Sky plot

Histogram

California Nebula - Nikon 180mm f/2.8 ED first light, 





    
        

            georgian82