Thanks to all who replied to my post about the loose secondary. I think the
final word is that it may be matched up, but no significant image
degradation will occur if it is a bit off. Since I can't leave well enough
alone, I will probably try the 'rotation test' suggested and see if I can
find a 'better' spot for it (after marking the current spot of course :) ).

Finding a clear spot through the clouds here in Wisconsin may be a tougher
challenge!
Thanks again,

Anthony J. Kroes
Green Bay, WI


> -----Original Message-----
> Cliff PETERSON
> Sent: Tuesday, May 01, 2001 5:37 PM
> Subject: Re: [M]: Secondary Spinning
>
>
> 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
>
>
>

View index by [date] [author] [subject]
Previous message: [M]: RE: Re: Secondary Spinning, Anthony J. Kroes
Next message: [M]: Re: Binoviewers, Michael A. Covington
Next message in thread: Re: [M]: Secondary Spinning, Alain Maury
Previous message in thread: [M]: RE: Re: Secondary Spinning, Anthony J. Kroes