> Can anyone direct to some information on the GPS model mirror lock
> mechanism? Did they just install the equivalent of a shipping bolt that
can
> be latched and unlatched or is it something more like the bisque mirror
lock
> collar?
>
> Thanks and clearest skies,
> Walt Cooney
> http://members.cox.net/waltc/BLACKBERRY_OBSERVATORY.htm
It's a bit like a collet chuck. A ring is driven round by a gear, and
tightens the collet. It works reasonably well, but _does not_ completely
remove mirror shift. It brings it down to perhaps 1/8 to 1/4 the level on
the older scopes, but there is still a small amount of rocking as the
front of the baffle tube moves.
With a guide scope, it allows exposures many times longer
than could be achieved with the older scopes, and the shift is slow, and
relatively 'smooth' across the sky, instead of having relatively fast
movements in some areas. On it's own, it is perhaps the best 'extra' on the
latter scopes.

Best Wishes

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