Click on any image for enlarged view!
General view of the cryostat being pumped. Notice the berylium
    window to allow characterization of the CCDs with a X-ray source.
    The CFH12K focal plane is ran by two SDSUII controllers (designed
    by Bob Leach). They are the boxes of both sides of the cryostat.
    The camera will be in a look-down configuration at the CFHT prime
    focus. Using the data acquisition system developed at CFHT, 4 electrons
    readout noise has been obtained on one test device during 58 seconds
    readouts (full mosaic). Both controllers will be synchronyzed to 
    within 6 nanoseconds.
    [Taken August 1998]
This picture shows four MIT/LL CCDs (CCID20) ready to be mounted on
    the CFH12K focal plane. Notice the flexprint that connects to a
    miniature SUBD connector. Extensive use of flexprint greatly reduces
    the number of wires inside the cryostat (e.g. the UH8K). Each device
    is about 3.5 by 7 centimeters (2048x4096 15um square pixels).
    [Taken August 1998]
View of the focal plane with 4 CCDs. The CCDs mount on the cold plate
    which temperature is monitored and regulated. Notice the short path
    from the CCDs to the controllers. CCDs are not aligned in regard of
    each other: proper calibration will be required on the sky to allow
    proper astrometric calibration.
    [Taken August 1998]
General view of the filter wheel (top). This is big. The rectangle
    window (the cryostat mount on that upper left plate) is about 15
    per 38 centimeters. The filter wheel can hold 4 filters at once.
    Filter can be easily changed through the port shown opened on the
    lower right.
    [Taken September 1998]
This second picture shows the stack assembly of the unit: the 
    shutter is positionned between the filter wheel and the cryostat.
    Notice the teeth of the filter wheel, the design is based on a
    geneva mechanisms. A filter frame is shown on the left.
    [Taken September 1998]
 One of the two CCD controllers. Each controller contains the following
    set of boards from SDSU: one timing board, one utility board, three
    clocking boards (one per two CCD) and three clocking boards also.
    They all connect on a common backplane powered by a power control
    board. The cables coming out from the clocking and video boards (three
    sets) connect onto the three hermetic 128 pins connectors that can
    be seen on the right (after the connector, inside the cryostat, all
    connections are made through flexprints). 
[Taken August 1998]