Hi Ray
I meant the depth from the top of the qhy8 body with the nose piece removed to the ccd surface. one side was between 2 and 3 mm deeper than the other when measured with a vernier. I might as well open and check again.
as for collimation, i was doing it on the bench with the cheshire and cats eye and then laser to reconfirm, and then just the laser when on the mount. But i might try the cats eye when on the mount at different positions indoors.
I've got enough info to test various things so will do that when the skies are clear. unfortunately that's a week away as its wet in Melbourne this whole week.
are the artificial star lights you get on ebay any good?
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