Hi Alan -- Sure -- The closer you move the camera chip to the pivot
point of the scope, the smaller the error becomes on the chip,
hence the smaller the correction required to recenter the image
(guide star).

best regards

Frank



> At 19:29 23-08-00 -0400, you wrote:
> >Frank Loch wrote:
>
> >> It also gave me a chance to try out a mod to shorten the optical path
> >> by 3". That resulted in a big improvement in tracking ability. 100%
> >> round stars (no eggys) in seven consecutive 900-1200 sec exposures
> >> compared to 50% success rate with the previous set up.
>
> Frank, could you explain to me why shortening the optical path improves
> guiding? Thanks, Alan
>
> _______________________________________________
> Shoklo Malaria Research Unit, Mae Sot, Thailand
> http://smru.thehealthzone.com/
> http://www.geocities.com/alan_astro my astronomy page
> _______________________________________________
>


Best Regards,

Frank Loch

Try Deep Space 99 at:

http://home.early.com/~floch/index.html

TPoint & DEC Bearing Mod at:

http://home.early.com/~floch/observatory.htm

Hubble's Variable Nebula project page:

http://home.early.com/~floch/lnai20.htm

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