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48
Telescope Maintenance
Aligning the Primary Mirror
To adjust the primary mirror:
1.
Locate the adjustment screws at the end of the tube where the primary
mirror sits.
2. Tighten and loosen the adjustment screws as needed to center the
reflection of the secondary mirror in the primary mirror. This is a trial
and error process!
The screws on the back of the primary mirror are paired. Within each
pair one screw pushes on the primary mirror while the other one pulls.
If you loosen a screw you must tighten its partner.
The primary mirror is now properly aligned. The telescope is in correct
collimation and will produce the best possible images.
Secondary Mirror
Reflection (with
reflection of eye)
Figure 8-3
This illustration on the left shows the image seen through the telescope
when properly collimated.
As mentioned in the text, most collimation
adjustments are made to the primary mirror.
The illustration on the
right shows the adjustment screws on the rear cell of the telescope.
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