Celestial hemisphere:  Southern  ·  Constellation: Carina (Car)
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Keyhole Nebula (f/20), Todd
Keyhole Nebula (f/20)
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Keyhole Nebula (f/20)

Acquisition type: Lucky imaging
Getting plate-solving status, please wait...
Keyhole Nebula (f/20), Todd
Keyhole Nebula (f/20)
Powered byPixInsight

Keyhole Nebula (f/20)

Acquisition type: Lucky imaging

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Description

Continuing my experiment with f/20 deep sky imaging, this image compared to my previous HOO at 765mm suggests there is marginal benefit at best of imaging large DSOs at 4000mm. And perhaps it was the additional 100mm of aperture that provided that benefit, and not the focal length.

Anyway, if you can over look the trailed stars (no point blinking: every sub trailed on the CG5), its not too bad

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Keyhole Nebula (f/20), Todd