Hello Bill,

> Bill - it is a Starlight Express guider as used in the AO unit. The guide
> camera is offset a short distance from the main camera chip. The AO unit now
> works a treat - after correcting the manual errors!!!

here you can find the setup, but without dimensioning:
http://www.starlight-
xpress.co.uk/Handbooks/Handbook%20for%20the%20Starlight%20Xpress%20S
XV%20AO%20unit.pdf

This PDF document is linked from here:
http://www.starlight-xpress.co.uk/handbooks.htm

Clear skies
Bernd
Bernd Brinkmann

Sternwarte Herne, MPC code A18
Herne, Germany

e-mail: info@...
http://www.sternwarte-herne.de