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The key factors for good CCD imaging are; exposure time, eld-of-
view, image size and pixel resolution. As the f-number goes down (or
gets faster), the exposure times needed decreases, the eld-of-view-
increases, but the image scale of the object gets smaller. What is the
dierence between f/2 and f/10? F/2 has 1/5 the focal length of f/10.
That makes the exposure time needed about 25 times shorter than at
f/10, the eld of view 5 times larger and the object size 1/5 compared to
that of f/10 (see Figure 8-8).

Telescope sTandard f/10 f/2
M
odel configuraTion configuraTion
8” 80” (2032 mm) 16” (406.4 mm)
9.25” 93” (2350 mm) 18.5” (470 mm)
11 110” (2800 mm) 23.1” (587 mm)
Auto Guiding
The CPC has a designated auto guiding port for use with a CCD
autoguider. Figure 8-9 may be useful when connecting the CCD camera
cable to the CPC and calibrating the autoguider. Note that the four
outputs are active-low with internal pull-ups and are capable of sinking
25 mA DC.
1 = No Connect
2 = Ground
3 = +RA (Right)
4 = +DEC (Up)
5 = -DEC (Down)
6 = -RA (Left)
1 2 3 4 5 6


31


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