Quote:
Originally Posted by mldee
... I noticed with bright Canopus that as I focused it, there was a large halo around it, and a bigger one further out. This is using Neb. Is this the infamous airy disk or just some sort of halo? The reason I ask is that the focused star was not centred on the halo, but about 10% or so offset.
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You sure it isn't a reflection off the CCD chip onto the last glass element and back onto the chip? If the glass and CCD are not both perfectly square to the light path you'll get an offset halo like that on bright stars.