SCT mirror lock... (was Re: [APML] piggy back guide scope size)

[astropix@att.net]

 Larry...

     Check out the way this fellow addressed the mirror flop issue:

 http://personalpages.bellsouth.net/r/r/rritter2/Celestron_C11_Mods/#Section_4

     He also has a great CCD gallery... be sure to surf through his home-page 
after looking at the tech stuff!

 Best...

 Geoff


> On my sc there is no mirror lockup. Does someone make an 2" OAG? If not then
> is there a way to manufacture a piece to lock up my mirror?
> Larry
> 
> 
> on 10/15/02 3:47 PM, Alan Voetsch at critter12952@yahoo.com wrote:
> 
> > --- Larry McManus <lmcmanus@clearpointadv.com> wrote:
> >> Can anyone give me a minnimum size for a guide scope
> >> to go on my sc. I have
> >> a 6 x 6 Hasselblad connected to the visual back of
> >> my 8" sc and I need to
> >> come up with a setup to allow me to guide on long
> >> exposures.
> > 
> > Hey Larry,
> > 
> > Kent's right. Because of the moving mirror in SCTs,
> > you are best advised to use an OAG, like a GEG or
> > Taurus T III. You could be guiding away perfectly
> > through a guidescope and there can still be any number
> > of ways that your shots will be wasted. Flexure,
> > mirror rotation, focus shift, OTA contraction due to
> > falling temperatures. Guidescopes on a SCT are a
> > crapshoot.
> > 
> > Alan
> > 
> > __________________________________________________
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> > 
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