Figure 2: Visual inspection of the telescope with help of WEB-camera Philips SPC900NC. Left: during
the observations in the moonlight, right: in the dome closed and the backlight turned on. Green LED
indicates that dome is closed
Another problem was discovered for 2 - 3 months after the installation of the telescope. These
were an insects, which with the approach of autumn begun to hide in the notches, particularly in the
gap between the corrector plate and telescope tube. We had to set a special cuff of soft tissue covering
the internal volume of the telescope tube to protect the telescope from this phenomen. The measure
was sufficiently effective, the need to clean the mirrors didn’t occur anymore.
If your task permits, limit the maximum speed of the telescope axis to a reasonable value, for
example: 3
◦
/s. This will prevent the breakdown of the DC motor in case of difficulty of the telescope
movement (e.g., at low temperatures).
2 Telescope finder
Do not rely on that the nominal alignment of coordinate system Auto Alignment made on stars
will serve a long time. No more than a few nights. It’s problematic to execute it remotely without the
additional equipment. Therefore throw away the standard holder of the finder and replace it with a
reliable, robust holder. On the finder install the CCD camera instead of the eyepiece. The same camera
Philips SPC900NC is suitable for this. The field of view will be sufficient: in the case of standard
RCX400 finder — 0.9
◦
× 1.2
◦
. It is advisable to mount the camera in a sealed metal housing. How to
remove the original packing one can found on the site ( tt http://www.robertreeves.com/900NC.htm).
You can see the stars up to 7
m
÷ 8
m
using the maximal exposure . In Fig. 3 the image of the
Pleiades, obtained with 5 frames per second and the automatic gain control (gain=auto) is shown.
The finder design allows you to focus the camera by rotating the objective on the thread. After
focusing the lens should be secured firmly to prevent its spontaneous shifts, otherwise the optical axis
of the finder and telescope will diverge with time significantly (a few arcmin).
3
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