Previous: Iris
Next: Pupil plane filter wheel
Previous Page: Iris
Next Page: Pupil plane filter wheel


The collimator has a focal length of 660.3 mm. The diameter of the collimated beam is 60.3 mm. The position of the collimated beam does however change as a function of field angle and wavelength, giving an effective total diameter for broadband wide-field observations of about 68 mm.

Thu Apr 7 00:29:52 BST 1994