Previous: Adjusting the CCD Camera for Tilt
Up: Spectrograph focus; adjusting the CCD camera
Previous Page: Adjusting the CCD Camera for Tilt
Next Page: Spectrograph focus; adjusting the collimator
The collimator may be adjusted to bring the spectrograph into focus. If the collimator has to be set far from its optimum position astigmatism will result. The optimum collimator position for the wide collimator is at about 10000 microns. If best focus is obtained outside of the range microns then the CCD dewar should be repositioned either further or closer to the camera mount. This is achieved by turning capstans A, B and C by the same amount. As a guide:
(N.B. Care here in altering the capstans should mean that no further tilt is introduced into the system!)