There are two guide CCDs, both identical KAI 340S 640x480 in size. The internal guide CCD is located in the main (red) camera body and has a FOV of about 3.0x4.0'. It's focus is the small black knob labeled 'Tracker Focus'. If the external guide CCD is installed it may block the light path for the internal guide CCD.

The external guide CCD sits in front of the filter wheel assembly and has a moveable pickoff mirror. There are three knobs on the external guider. The one in the middle is the focus, and next to it is a knob that adjusts the position of the pickoff mirror. There is a third knob on a different side that is the lock for the pickoff mirror. The FOV of the external guider is about 1.4 times larger than that of the internal guider because there is a focal reducer in the optical path.

For the system to guide while taking an exposure, it must use the correct drivers on the computer for both the main CCD and the guider. These are described below.

------------- Computer Setup ---------------
Do these in the following order. They may come up automatically if a setup configuration has been
created and stored. The green Ready light needs to be on for each one.

Camera Tab
  Camera Setup -> Choose -> SBIG with AO
  Settings -> Interface = USB
  Close
  Connect (green Ready Light comes on)

Filter Wheel Tab
  Setup -> Choose -> FW-7 STX
  Close
  Connect (green Ready Light comes on; filters should move)

Autoguider Tab
  Setup -> Choose -> Imager's Built-In Autoguider
  Settings -> Internal autoguider   (Separate focus - black knob)
           -> or External autoguider (Separate focus, Movable mirror, bigger FOV)
  Close
  Connect (green Ready Light comes on)

------------- Taking Data ---------------
The idea is you find your object, find a guide star, start the guide exposures and then
start the main exposure. Guiding can be done manually in the telescope tab.

Slew to Target
Autoguider Tab (blue)
   Set exposure time and delay
   'Take Photo' to see the whole guider field (focus if need be)
   Find guide star either with cursor or input (x,y)
   The autoguide exposures can subtract dark. Decide if you want to do that (drop down menu)
   Hit 'Autoguide' to start exposures. 
   You can pick how it displays with the icons at the bottom of the display window

Camera Tab
    Decide if you want a dark in the processing drop down menu
    Set the exposure time and choose the filter you want
    Hit 'Take Photo', go immediately to the telescope tab for manual guiding

Manual guiding: Go to Telescope Tab
    Down near the bottom pick 'Jog' and an interval to guide, e.g. 0.5 arcseconds
    Jog as needed to keep your star in the guide box of the Autoguider exposure

------------- Notes ----------------------
* There is both a Camera output window and a separate Autoguide output window
  When you get everything to work, the Autoguide window will update while you 
  are exposing the main CCD in the Camera window.

* The default autoguide window is only 8x8. This is adjusted in the  Autoguider Tab via
  Setup -> AO Settings -> Track box size (Small, Medium, Large, XL, XXL)

* The focus on the guider won't ever be perfect. It is off-axis and for the external guider
  goes through a focal reducer. It is good enough for guiding purposes.