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Hi Jason,
Thanks very much for your reply. I saw those images and that's what I saw when collimating without the laser, I just didn't follow that thinking through to the logical conclusion that the laser dot would appear offset.
As for the diffraction spikes... to be honest, that's the first I've ever heard of them. It makes perfect sense, but that's just something I haven't come across in my reading. I'm only very new and I'm self taught (well, self and internet taught) so I guess I've missed a few things!
Thanks again for your time and patience. Cheers!
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