Mobotix D24M Manual page 31

General MOBOTIX Camera Functions
Lens Table
Original image
35 mm equivalent focal length
Actual focal length
Aperture
Horizontal image angle
Vertical image angle
Distance 1 m (1.09 yd)
Image width
Image height
Distance 5 m (5.47 yd)
Image width
Image height
Distance 10 m (10.94 yd)
Image width
Image height
Distance 20 m (21.87 yd)
Image width
Image height
Distance 50 m (54.68 yd)
Image width
Image height
The specified focal lengths of MOBOTIX lenses do not reflect the actual focal length
of the lenses, but the focal length (Lxx mm) converted to 35 mm camera format. For
example, the MOBOTIX Super Wide Angle lens has an actual focal length of 4 mm. This
would be the equivalent of 22 mm on a 35 mm camera. This lens is thus called L22.
Since the image sensors in digital cameras have different sizes, converting the focal
lengths to 35 mm camera as a known format allows the image formats and the
fields of vision of the different lenses to be calculated and compared more easily.
Another benefit is that you can easily set a 35 mm camera (analog or digital) to the
same focal length as the MOBOTIX lens (Lxx) to obtain the same field of vision. This
approach greatly facilitates lens selection.
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L22 L32 L43
22 mm 32 mm 43 mm
(1.26 in) (1.26 in) (1.69 in)
4 mm 6 mm 8 mm
(0.16 in) (0.24 in) (0.31 in)
2.0 2.0 2.0
90° 60° 45°
67° 45° 34°
m m m
2.0 1.1 0.8
1.3 0.8 0.6
m m m
10.0 5.7 4.1
6.6 4.1 3.0
m m m
20.0 11.5 8.2
13.3 8.2 6.1
m m m
40.0 23.0 16.4
26.6 16.4 12.2
m m m
100.0 57.5 41.0
66.0 41.0 30.5
Notes
L65 L135
65 mm 135 mm
(2.56 in) (5.31 in)
12 mm 25 mm
(0.47 in) (0.98 in)
2.0 2.5
31° 15°
23° 11°
m m
0.5 0.3
0.4 0.2
m m
2.7 1.3
2.0 1.0
m m
5.5 2.6
4.0 1.9
m m
11.0 5.2
8.0 3.8
m m
27.5 13.0
20.0 9.5
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