polar alignment and mirror adjustment
- I have an old Criterion 6" reflector and wondered if there is anyone
in the Oxford/Easton/St Michaels area that might show me the basics of
polar alignment and mirror adjustment (I am told the prior owner sought
to make some adjustments of doubtful necessity)?
Thank you very much for your help.
> I have an old Criterion 6" reflector and wondered if there isanyone
> in the Oxford/Easton/St Michaels area that might show me thebasics of
> polar alignment and mirror adjustment (I am told the prior ownersought
> to make some adjustments of doubtful necessity)?I also have a 6" RV-6 scope from my youth. They tend to have good
optics (although if you have the original Ramsden eyepieces it may
be worth an upgrade). Mirror adjustment (collimation) is sometimes
needed, especially if the scope is jostled around. It is one of
those things that is not terribly hard (at least to get an
acceptable alignment) but is easiest when shown in person. I'd
suggest that you consider coming by the No Frills star party where
I'm sure you'd get some helpful instruction (I'm north of Baltimore
but hope to make it for at least one evening). In the meantime there
are good articles on the web such as this one in S&T:
As for polar alignment - my experience with the RV-6 is that the
motor in the clock drive is the unit's Achilles' heel, often failing
within a couple of years. If it is functional then sighting along
the motor housing to Polaris is probably sufficient to allow some
tracking and reduce the need to constantly nudge your target back
into the field of view.
Hope that helps - perhaps see you at No Frills?