- 20 -
⑥ In this process the center of the
reflection of the collimating eyepiece
has been shifted off center as seen on
the Fig. C-10. Then it becomes necessary
to rotate and tilt the secondary mirror so
that the center of the reflection of the
collimating eyepiece in center on the
crosshairs. In the Fig. C-10 the secondary
mirror is rotated so that the reflection on
cross hair and in the Fig. C-11 the
secondary mirror is tilted so that the
center reflection of the collimating
eyepiece in centered on the crosshairs
by tightening push screw A. Now the
center reflection if the collimating
eyepiece is centered over the crosshairs
as well as the center dot on the
secondary mirror.
Loosen and turn the
secondary holder.
Then, tighten it lightly
by hand
Turn the secondary holder.
Push
Fig. C-10
Fig. C-11
Crosshairs of collimating tube
Secondary mirror
center dot
Secondary mirror
Outside edge
of collimating
eyepiece
This side is wider
due to the offset of
the
secondary
mirror
[This figure illustates the collimation
of the correct secondary mirror.](Note:
In this illustration the circle on the
primary mirror has been left out.
Fig. C-12
The orbit when the corss point
of the crosshair is turned
The secondary mirror mark
Adjust
Fig. C-13
Center circle of the
collimating eyepiece
Summary of Contents for e-130D
Page 1: ...1 ε 130D Hyperboloid Flat field Astrograph Instruction Manual TAKAHASHI ...
Page 26: ... 26 ...
Page 27: ... 27 Memo ...
