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The slit and decker assembly is mounted at an angle of 13
to reflect
light from the slit jaws to an intensified CCD TV for aquisition and guiding.
A zoom lens is installed before the TV for changing the field of view and
optimizing the apparent slit width in the digital memory guider box. A
slit width of about one third the width of the guider box will be
satisfactory for auto-guiding. See §7.4 for a discussion of operating
the leaky memory guider. The AC power switch on the left side of the
slit head control panel must be on to operate the zoom lens,
but it may be controlled either at the panel or by buttons on the
coudé observing room control rack.