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 TM 9-258
Figure 5-13. Galilean system.
(2) This is the only telescopic system in
which the diameter of the objective controls the field of
view (width of visible observed area), as the objective is
both field stop and entrance window (fig 5-15). This
system is, therefore, limited to small fields and low power
and usually is designed for 2 or 3 power.
Figure 5-14. Relations of elements in Galilean telescope
(zero diopter setting)
5-7
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