12
Table 1
Read the value for distance “A” that corresponds to one tick by referring to table 1.
Ex.: When the total feed amount in the crosshair image is 12 ticks (the eccentricity is 6) and the
distance “A” between the target lens and the objective lens is 50 mm
The amount of eccentricity (
θ
) = 41 (seconds) x 6 (ticks)
= 246 (seconds)
= 4 (minutes) and 6 (seconds)
Distance “A”
between the lens you
want to measure and
the objective lens
Value of one tick in
the eyepiece
(minutes and
second)
10 mm
3 min. and 26 sec.
20 mm
1 min. and 43 sec.
30 mm
1 min. and 9 sec.
40 mm
52 sec.
50 mm
41 sec.
60 mm
34 sec.
70 mm
30 sec.
80 mm
26 sec.
90 mm
23 sec.
100 mm
20 sec.
