TM 9-1556
3-4
3. DIFFERENCES BETWEEN MODELS.
a. Despite their similarity in many respects, there are some differ-
ences between these models, as shown by the following comparative
specifications:
M48
M49
Power
19.6x
20x
Field of
view
28'
212'
Diameter
of exit pupil
0.100 in.
0.108 in
E. F. L.
of objective
13.004 in.
14.211 in.
E. F. L.
of eyepiece
0.662 in.
0.716 in.
Length
14 in. approx.
13 in. approx.
DESCRIPTION
OBSERVATION
TELESCOPE
M48.
a.
Observation Telescope M48 (fig. 1) is a 19.6-power telescope
having a field of view of 2 degrees 8 minutes and an exit pupil
diameter of 0.100 inch. The image is erected by a porro prism system.
The over-all length of the telescope with the sunshade closed is ap-
proximately 13 inches.
