When I talked to John at Meade he indicated that the primary, secondary and corrector were all position dependant. In looking at mine the corrector is marked. I've never had the primary out so I don't know there. As far as the secondary is concerned on mine it is held in with two pieces of plastic with threads that if over tightened or if heating is just right jump a thread and get loose, then turn. This has happened to mine and I never could find any marks that would indicate how to realign them. This causes me worry but maybe it isn't that critical and I am worried about nothing.

Cliff

"Anthony J. Kroes" wrote:

> Is the rotated position of the secondary 'matched' to the primary the
> way that the corrector plate is?

Yes.

> ... it got me
> thinking whether it makes any difference at all, or all the
> difference in the world,

Unless the optics were really bad (unusual with modern SCTs,
but they do still ship occasionally) the difference may not
even be noticeable.

> and if it does, how would one get it back to the original
> position?

1) Examine the housing for any marks, most likely in pencil.
2) Set up the system for an optical test, and then start
rotating the secondary, marking each point when
the image quality peaks. Then compare each of the
peak positions and find the best. With this method
you may actually improve the image over the stock
orientation. When matching optics the factory
looks for the first peak. Not the best.

Gene Horr




>
> Anthony J. Kroes
> Green Bay, WI

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