The light from telescope (above) passes a mirror with a hole. The central rays then pass thru a 20 slot filter wheel and then strikes the Apogee Instruments camera. You can see the filter wheel better from the top view
Rays outside of the 25mm diam field will be reflected by the mirror, pass through a field flattening lens and ultimately to the guide camera. The guide camera is a Spectrasource Peltier cooled CCD camera using a small format using a Texas Instruments TC244 192x165 pixel imager. The field of view of the guider is ??x??.
The camera is mounted on a New England Affiliated Technologies OF-4040-SM XY translation stage with a 50x50 mm total motion allowing the guide camera to be placed anywhere in the ??x?? field. The guider field suffers severe and variable vignetting over this range.
