Celestial hemisphere:  Northern  ·  Constellation: Hercules (Her)  ·  Contains:  Extremely wide field
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Test images - step down rings applied on Messier 13 + η Herculis, AC1000
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Test images - step down rings applied on Messier 13 + η Herculis

Getting plate-solving status, please wait...
Test images - step down rings applied on Messier 13 + η Herculis, AC1000
Powered byPixInsight

Test images - step down rings applied on Messier 13 + η Herculis

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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

Revisions

  • Final
    Test images - step down rings applied on Messier 13 + η Herculis, AC1000
    Original
  • Test images - step down rings applied on Messier 13 + η Herculis, AC1000
    C
  • Test images - step down rings applied on Messier 13 + η Herculis, AC1000
    H
  • Test images - step down rings applied on Messier 13 + η Herculis, AC1000
    I

C

Description: Canon EF 200 mm with 3 step down rings

Uploaded: ...

H

Description: 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

Uploaded: ...

I

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

Uploaded: ...

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Test images - step down rings applied on Messier 13 + η Herculis, AC1000

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