Takahashi FOA-60, Instruction Manual

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Finder Adjustment
In the view field of a telescope, the image
is seen highly magnified so it is so difficult
to get a desired object in the field of view.
Also when photographing an object with a
camera, the image of the object on the focal
plane is so dark it makes it difficult to center
in the field of view. A finder is a useful tool. It
permits the precise centering of an object in
the field of view. The wide field of the finder
can find an object easier in the view field.
Therefore, it is important that the finder and
the telescope be in alignment.
◆ Focusing
When you see some objects far away, if the
finder is not focused, adjust the finder as
follows.
1. Loosen the lock ring.
2. Viewing some objects far away, hold the
eyepiece and focus the finder by turning
the eyepiece clockwise and counter-
clockwise.
3. When focused, tighten the lock ring.
◆ Finder Alignment Procedures
1. Set up the telescope for visual use
according to the system chart and attach
a low power eyepiece. Then, select a
clearly noticeable object far away and
center it in the view field.
2. Then, change the eyepiece to a high
power one and again center the object in
the view field. Then, lock the telescope.
3. Looking through the finder, move the
finder with the following method and
adjust it so the object is centered at the
crosshair.
4. Turn all the lock nuts until they reach the
head of the adjusting screw.
5. In order to move the crosshair in the
direction of the arrow, first loosen the
screw (a) and tighten (push) the finder
with the screw (c). Next loosen the screw
(b) and tighten (push) the finder with the
screw (c). This procedure will move the
crosshair in the desired direction. The
top of the finder will move in the opposite
direction and the object will move in the
direction of the smaller arrow.
6. Turn all the lock nuts until they reach
the finder bracket and lock the adjusting
screw.
a
b
c
Field of View of the Finder
Crosshair
Field of View of
the Main Telescope
Finder Bracket
Finder Adjusting Screw
Lock Nut
Focus Lock Ring
Eyepiece
Lock Screw
Finder