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Telescope
Model
Standard
Cassegrain f/10
With
Reducer/Corrector
f/6.3
C5-S
49" (1250mm) 31" (788mm)
C8-S
80" (2032mm) 50.4" (1280mm)
Focal
Length &
Speed
C9.25-S
93" (2350mm) 58" (1481mm)
C5-S 13 x 10 (arc
min)
20.5 x 15.7 (arc min)
C8-S 8 x 6.1 (arc
min)
12.6 x 9.7 (arc min)
ST 237
F.O.V.*
C9.25-S 6.9 x 5.3 (arc
min)
11 x 8.4 (arc min)
* Field of view calculated using SBIG ST 237 CCD camera with 4.7mm x 3.6mm
chip.
Auto Guiding
The Advanced GT telescope has a designated auto guiding port for use with a CCD autoguider. The
diagram below may be useful when connecting the CCD camera cable to the telescope and calibrating the
autoguider. Note that the four outputs are active-low, with internal pull-ups and are capable of sinking 25
mA DC.
Table 7-3