NA2/NAK2-2.0.0en
Measurement preparation
13
Focusing telescope
1. Aim telescope against a
bright background (e.g. white
paper).
2. Turn eyepiece until reticule is
sharp-focused and black.
Now the eyepiece is adjusted
to your eye.
3. Aim telescope on staff using
the coarse aiming device.
4. Turn focusing knob until
image of staff is sharply
focused. If the eye is moved
up and down behind the
eyepiece the image of the
staff and the reticule should
not move relative to each
other.
For centring over a ground
point:
1. Attach plumb bob.
2. Loosen central fixing screw
slightly and shift instrument
parallel on tripod until the
plummet is exactly over the
point.
3. Tighten central fixing screw.
Centring
NA-15
NA-16
NA-17
26
25
27
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