Specifications

Section 1 - Introduction
Page 16
1.1.13. Opening the Front Cover - Changing Filters
The filter wheel is contained inside the front cover plate. To access the filter wheel remove the
eight socket head screws located in recessed slots around the perimeter of the front cover. With the
camera lying on its back plate (or on the camera handles if attached), remove the front cover by
lifting straight up away from the main body. You will notice resistance as the front cover is still
connected to the main body through a self-aligning electrical plug.
This plug will separate and the front cover will come free with a firm
but gentle pull. It may be easiest to
hold the main body with your hands
and push up on the corners of the
front cover nearest the connectors
with your thumbs. Filters may be
inserted and removed with the filter
carousel in place. The filter carousel
accepts both 48mm threaded filter
cells (below right) and 50mm round unmounted filters (below
left). Thick unmounted filters may be held in place by turning
the shouldered retaining washers (arrows)
upside down to capture the filter. We
recommend the 50mm filters for minimum
vignetting, particularly with the KAI-11000M
CCD. If you have more than one set of filters
you may find it easier to purchase one or more
additional carousels and
populate them with your
filter sets. In this case, you
can change sets by swapping carousels. The filter carousel is held in place by a
single screw in its center. Remove this screw and carefully remove the carousel
by sliding it up and away from the motor. Be careful not to lose the small flat
washers that go between the carousel and the front cover. These must be
replaced when reassembling the filter wheel to the cover or the carousel will
not work properly. After installing or changing filters, replace the
carousel taking care to replace the small washer between the
carousel and the inside of the front cover. The small steel washer
fits into a recessed cutout in the cover, then the larger white
Teflon washer goes on top of the steel washer. The carousel is put
in place next and the assembly is secured with a screw and Teflon
bearing through the center of the filter carousel. DO NOT OVER-
TIGHTEN THE CENTRAL SCREW. It is only necessary to tighten
the central screw until it is snug. Over-tightening the screw may
impair the operation of the filter wheel. When reassembled,
replace the front cover assembly containing the filter carousel on
the camera. Orient the front cover so that the self-aligning connector plugs are together and gently
push straight towards the main body to seat the front cover. Replace the 8 retaining socket head
screws to hold the front cover in place.