Figure 14.6 F-Number And Close Focus Limits For Various Lenses - FLIR ThermaCAM P20 Operator's Manual

D →
D →
80° IFOV

Figure 14.6 F-number and close focus limits for various lenses

Lens →
Close focus limit (m)
Close focus limit (ft.)
f-number
Publ. No. 1 557 536 Rev. a35 – ENGLISH (EN) – January 20, 2004
1.20 5.00
3.90 16.40
0.25 1.03
7° 12°
4 1.2
13.11 3.93
1.0 1.0
14.10 – Relationship between fields of view and distance
10.00 25.00
32.80 82.00
2.06 5.16
24° 45°
0.3 0.1
0.98 0.32
1.0 1.0
50.00 100.00
164.00 327.90
10.31 20.65
65° 80°
0.2 0.15
0.64 0.49
1.5 1.0
m
ft.
in.
71