42
Collimation
SECONDARY MIRROR HOLDER ADJUSTMENTS:
If the
secondary mirror
(fig. 6, #1) is centered in the
draw
tube
(fig. 6, #2), but the
primary mirror
is only partially visible
in the reflection (fig. 6, #3), one or more of the 3
secondary
mirror collimation screws
need adjusting. First, unthread
each of the secondary mirror collimation screws slightly to the
point of where you can tilt the secondary holder from side-to-
side.
By grasping the secondary holder with your hand, tilt the
secondary mirror holder until you see the primary mirror become
as centered in the reflection of the diagonal mirror as possible.
Once you are at the best position, thread in the 3
secondary
mirror collimation screws
to lock the holder in place. Then,
if necessary, make adjustments to these 3 screws to refine the
tilt-angle of the secondary mirror until the entire primary mirror
can be seen centered within the secondary mirror reflection.
When the secondary mirror is correctly aligned, it will look like
Figure 7.
Figure 6
Note: The primary mirror is shown out of alignment.
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