Re: [APML] piggy back guide scope size

[Larry McManus <lmcmanus@clearpointadv.com>]

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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