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Hi Tim,
You're right, collimating on an off centre star is incorrect, that is why I suggested for MaximDL users to turn on their cross hair to determine the central point. Here is where the concentric stars must be in the FOV.
The elongated stars surrounding the centre will help you determine where this collimation point is, thats all.
I'm not sure about other peoples experiences, but in the past I found using a single defocused star could lead to not having this collimation point being central to the FOV. Having extra stars within the FOV helps to determine where this is. That's all.
Cheers
Steve
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