Quote:
Originally Posted by alpal
Thanks Richard,
method C does seem to take care of the offset away from the focuser.
I don't have a sight tube or a Cheshire.
I think I need to get those devices.
It seems that the offset away from the focuser -
is built into the design of the spider hub on some telescopes?
It seems that most spider hubs don't have that - why?
This is becoming a huge mystery.
cheers
Allan
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I don't know why either Allan. I certainly don't claim to be an expert. I'm just doing what I've always done and the stars test good so that's good enough to me. I wonder if its imaging scopes or high end maybe that do it that way so there is no tilt in the system that would show up under very close scrutiny. Hopefully someone better qualified than me will chime in.
Cheers to you, Richard