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of the rectangle. This may be used to show the area covered by a
camera or CCD image. A dialogue box will now appear with the items:

Show Frame
Center Frame
Angle:
Focal length:
(Camera name)
Spin Left      Spin Right
Show Pixels
Guider Range
Binning:

   The first item simply toggles between showing and not showing the
frame.  The "Center Frame" check-box causes the CCD frame to remain
at the center of the screen as you pan around,  instead of staying
fixed relative to the sky.  Changing the "Angle" value lets you set
the tilt of the frame to any desired angle.  (The "Spin Left" and
"Spin Right" options each cause the frame to rotate a few degrees,
and may be more helpful.)

   You can then select the focal length of your telescope,  and the
identity of your CCD camera.  A few points:  you can switch between
a focal length in millimeters and one in inches,  by using the
"Units" section of the "Format" dialog box (described on page
32). Certain film format sizes,  including the ever-popular 35mm
frame, are given in the list.  As you change these parameters,  Guide
will update data on the angular dimensions of the frame and pixels.

   If you choose an SBIG or similar camera with a guiding chip,
then the guider chip will be shown at the proper scale and position.

   If your camera doesn't appear in the list shown by Guide,  you
should first check the Project Pluto Web site for updates to the
software.  If the camera is still not listed,  please contact Project
Pluto;  it does happen that new cameras escape our notice until
someone mentions that they aren't listed.

   Set the 'show pixels' check-box,  and the grid of pixels will be shown
overlaid on the CCD frame.  If the 'binning' option is set to something
other than 1x1,  then the binned pixels will be shown (that is,  the
grid will be made sparser).

   Set the 'guider range' check-box,  and if the currently selected
camera has a guiding chip,  range rings will be added to the display
to indicate the area the guiding chip could cover.  If you want to
rotate the CCD to a particular point,  you can then right-click on
that part of either the inner or outer range ring.  You'll then see
an option to "Rotate CCD".  Click on that,  and the CCD will rotate
to that point.
                                                     

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