Takahashi E-160ED, Instruction Manual

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Collimating the Primary
ی
To collimate the primary mirror, simply align
the primary mirror mark with the secondary
mirror mark. The primary mirror is adjusted
by pushing and pulling the three collimating
screw sets. Moving only one will deform
the mirror and adversely affect its shape,
so loosen the other two screw sets
simultaneously. First, loosen the primary
mirror collimating screws (3) on the side of
the bottom ring. After adjusting the optical
axis of the oblique mirror, if the primary
mirror mark is off as shown in Fig. C-15,
press the screw on the A side. While
adjusting the other screws, adjust so that
the primary mirror mark, the secondary
mirror mark, and the collimating eyepiece
are concentric as shown in Fig. C-16.
The secondary mirror mark Adjust
The orbit when the cross point
of the crosshair is turned
Figure C-13
Figure C-14
3 primary mirror adjustment screws (A, B, C)
View when optical axis correction is completed
Primary Mirror Mark
Collimating Eyepiece
Figure C-16
Figure C-15
When the optical axis of the secondary
mirror is aligned (the primary mirror mark is
omitted in this figure), but if the eyepiece is
rotated, the crosshair may shift with respect
to the secondary mirror mark. See Fig.
C-13. In that case, a correction is necessary.
Correction ▼
Adjust the set screw so that the crosshair
moves around the mark as shown in Fig.
C-13. Then, the opening of the collimating
eyepiece deviates from the secondary mirror
mark. Next, loosen the pull screw as in step
6 and rotate the secondary mirror so that
the collimating eyepiece is on the horizontal
line. Adjust with set screws to match.
A C
B
After collimating the primary mirror, tighten
the primary mirror adjustment screws.
These screws double as the centering of
the primary mirror cell and the locking of the
cell.