17
Note: This calibration method can be applied to both refract-
ing and reflecting telescope designs. Differences in the optical
path of telescopes do not affect how the telescope tube and
tube rings should be adjusted on the mounting plate.
Figure 20.
gently push the telescope horizontally to determine
direction of optical axis offset.
Figure 19a‑b.
Rotate the telescope 180° about the R.A.axis.
Figure 21a.
Adjust the optical axis offset screws this way if Polaris
moves toward the center of the eyepiece when the tube is pushed as
in Figure 19.
Figure 21b.
Adjust the screws
this way if Polaris moves away
from the center of the eyepiece.
a.
b.
