5 eyepiece adjustment – Pentax ETH-310 User Manual
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4.5 Eyepiece adjustment
After [4.4 Centering with the optical plummet] completed, focus the
telescope eyepiece on the telescope reticule.
Remove the telescope lens cap.
Point the telescope at a bright object.
Rotate the eyepiece completely counterclockwise.
Look through the eyepiece, and rotate the eyepiece clockwise until the
reticule appears at its maximum sharpness.
At procedure
, keep your eye relaxed to prevent parallax and eye
fatigue. Parallax causes problems with object sighting.
(Refer to [4.6 Object sighting])
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2
3
4
Horizontal graduation
(double)
Vertical graduation
(single)
Vertical graduation
(double)
Optical axis
Reticule pattern
4