Accessories
Add-on Lenses
35
7
7.1.1 Tele Lens 2x
Field of View (FOV)
17° x 12.7° (horizontal x vertical)
Instantaneous Field of View (IFOV)
0.9 mrad (1 pixel)
Measurement Field of View (MFOV)
2.8 mrad (3 x 3 pixel)
Focus Range (infrared)
406 m
m to ∞ (1.3 ft to ∞)
Focus, fixed (visible)
600 mm (1.96 ft)
Table 7-3: Spot Sizes for Tele Lens 2x
Measuring distance
Thermal image (H x V)
Minimum detectable spot size
(1 pixel)
Minimum measurement area
(3 x 3 pixel)
0.5 m (1.6 ft)
0.149 x 0.111 m (0.5 x 0.4 ft)
0.5 mm (1.5 mil)
1.4 mm (4.5 mil)
1.0 m (3.3 ft)
0.299 x 0.223 m (1 x 0.7 ft)
0.9 mm (3.1 mil)
2.8 mm (9.2 mil)
5.0 m (16 ft)
1.49 x 1.11 m (4.8 x 3.6 ft)
4.6 mm (14.8 mil)
13.9 mm (44.5 mil)
10 m (33 ft)
2.99 x 2.23 m (9.9 x 7.3 ft)
9.3 mm (30.6 mil)
27.8 mm (91.8 mil)
Figure 7-2: Dimensions of ThermoView TV40 with Tele Lens 2x
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