Re: [ATM] History of moving mirrors for Schmidt Cassegrains.

[Andy Saulietis <iss@pvtnetworks.net>]

Re moving mirror focusing:

>Designed for Celestron as a way to get a very large focal range.  The basic
>design was then copied by Bausch and Lomb and then Meade (apparently no
>patent on the method?) and is the way that the SCTs focus as a result.
>The basic design does have the bad flaw of not being able to hold the
>primary in collimation as focus changes but the spherical primary does help
>a lot in hiding the problem.

Questar also uses this method, their OTA is Maksutov. Don't
know if they predate Celestron, but the Questar one doesn't
go out of collimation..much better designed/made. Lots
more $ also..


Andy Saulietis
ISS Enterprises
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