NA720/NA724/NA728/NA730-1.0.1en
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 deep
black. Now the eyepiece is
adapted 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 reticle may not
be displaced against each
other.
For possible 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
25
26
27