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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 31). 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. The field of view of the camera, and pixel size, will be computed from the camera specifications, binning level, and focal length, and shown at the bottom of the dialog. 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. There is also a special way to move the frame to a new position: put the cursor where you want the frame to be, hold down the Ctrl key, and click on the right mouse button. This will turn the frame on (if it's not already on) and re-draw it, centered on the cursor. Doing the same thing with the Shift key will rotate the frame so that it points toward the place where you clicked. 7e: The Legend Menu The Legend menu in the Display menu controls what is shown in the area at the lower left corner of the chart. This legend is
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