Quote:
Originally Posted by [1ponders]
The double spikes indicate that the image is still not quite in focus. Why only the horizontal one are double I don't know???
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Hi Paul. This is an old thread I know but more or less on topic for the question I'm asking.
In the attached image, the diffraction spikes are not double but split. Does this suggest collimation and/or tracking to you?
It's a single 5 min sub at ISO 200 - I was trying to do some short exposures of Alnitak so I could layer them into some brighter images taken a few nights back.
Peter