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WHY YOU NEED A FINDER SCOPE
1. Aligning the Finder scope (A80Mf, R130Sf and ED80Sf)
Choose a conspicuous target in the distance
and place the target in the center of the field
of view of the telescope in accordance with
procedures I to III in Basic Operation.
In the illustration, a distant tower is brought
into the center of the field of view of the
telescope.
Next, look through the finder scope. You
should probably find the same target some-
where within the finder’s field of view.
In the illustration, the tower is seen in the
upper right of the finder’s field of view. The
finder scope has crosshairs.
Align the optical axis (field of view) of the
finder scope with the optical axis (field of view)
of the telescope. Adjust the finder scope by
loosening or tightening the adjustment screws
A and B until the target is in the same position,
in the center of the crosshairs.
In the illustration, the top of the tower is
in the center of the crosshairs.
Standing behind the telescope, loosen the lock ring on the finder
scope by turning it counter-clockwise allowing the objective barrel
(front end) to rotate freely.
While looking through the finder scope as far into the distance as
possible, rotate the objective barrel to find best focus.
When the finder scope is in focus, tighten the lock ring to secure
the objective barrel.
For the novice telescope user it is difficult to locate a selected object in the field of view at high
magnification. Using a finder scope will make this easier.
Place the tower in the center
of the telescope’s field of view.
Field of view of the finder scope
Adjustment Screw B
Example: The top of the tower can be moved toward the center of the
crosshairs by looseningthe adjustment screw A and tightening the
adjustment screw C.
Example: The top of the tower can be moved toward the center of the
crosshairs by looseningthe adjustment screw A and tightening the
adjustment screw C.
Adjustment
Screw A
Field of view of
the finder scope
Top
Place the tower in the center
of the telescope’s field of view.
Field of view of the finder scope
Top
Be sure to align the finder scope with the telescope before you start observing.
Each of the finder scopes is pre-adjusted to focus at infinity before shipment from the factory but
individual eyesight varies. As a result it may not be focused at infinity for you. The finder scopes for
the A80Mf, R130Sf and ED80Sf have a focuser ring that allows you to make adjustments if necessary.
Lock Ring
Focuser Ring
Lock Ring
Focuser Ring
BASIC OPERATION
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