Vixen AGA-1 - Manual (Page 7)

telescope precisely as you do for guided astrophotography. Attach a
guiding scope, a CCD video camera and a camera to the telescope.
[
TIPS ON SETTING UP ]
(a) Align the polar axis precisely.
The polar axis must be aligned precisely to enable the autoguiding
to be within the range of the guiding error allowance.
(b) To attach the CCD video camera to the guiding scope, an optional
T-C ring as well as an optional camera adapter 36.4mm type or
43mm type is needed.
(c) The appropriate combined focal length of the guiding scope
depends on the photographic lens you use, but it should be
1000mm to 2500mm.
If it is shorter, the guiding accuracy will not be sufficient. If it is
longer, the motor speed and turning direction check (Drive Check
Mode) will not function well.
Even if you use a guiding scope with the excessively long focal
length, the guiding accuracy will not become higher.
(d) The use of a high-sensitivity monochrome CCD video camera with
a C-mount lens adapter is recommended for AGA-1.
A color CCD video camera is not sensitive enough.
CONNECTING AGA-1
After Setting up the telescope, connect AGA-1 to the motor drive
controller, CCD video camera and monitor. At this time, make sure
that each instrument is switched off.
1. Connecting AGA-1 to the CCD video camera