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Contains:  Extremely wide field
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Testing step down rings - Messier 13 + η Herculis, 





    
        

            AC1000
Testing step down rings - Messier 13 + η Herculis

Testing step down rings - Messier 13 + η Herculis

Technical card

Resolution: 2601x1732

Dates:May 25, 2019

Frames: 26x120" ISO1600

Integration: 0.9 hours

Flats: ~24

Bias: ~50

Avg. Moon age: 21.09 days

Avg. Moon phase: 61.16%

Astrometry.net job: 2714517

RA center: 250.687 degrees

DEC center: 37.737 degrees

Pixel scale: 9.099 arcsec/pixel

Orientation: 358.558 degrees

Field radius: 3.950 degrees

Data source: Backyard

Description

To avoid spikes at brighter stars a set of step down rings
in front of the lens down to 43 mm were applied.
The internal lens aperture stopper was set to f/4.

Comments

Author

AC1000
AC1000
License: None (All rights reserved)
1412
Like

Revisions

  • Final
    Testing step down rings - Messier 13 + η Herculis, 





    
        

            AC1000
    Original
  • Testing step down rings - Messier 13 + η Herculis, 





    
        

            AC1000
    C
  • Testing step down rings - Messier 13 + η Herculis, 





    
        

            AC1000
    H
  • Testing step down rings - Messier 13 + η Herculis, 





    
        

            AC1000
    I

C

Canon EF 200 mm with 3 step down rings

H

another test with step down rings down to 43 mm to avoid spikes with the Canon EF 200 mm tele lens, part of Corona Borealis: 7 lights - each 2 min, 20 flats, 50 bias, internal lens aperture stopper set to f/4, stars in the center are looking good but away from image center stars are showing slight spikes

I

same as version H but internal lens aperture stopper was set wide open (f/2,8) - no spikes visible

Sky plot

Sky plot

Histogram

Testing step down rings - Messier 13 + η Herculis, 





    
        

            AC1000