Mobotix D24M-Sec User Manual download pdf (Page 31)

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General MOBOTIX Camera Functions

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Lens Table L22 L32 L43 L65 L135

Original image

35mm equivalent focal length

22 mm

(1.26 in)

32 mm

(1.26 in)

43 mm

(1.69 in)

65 mm

(2.56 in)

135 mm

(5.31in)

Actual focal length

4 mm

(0.16in)

6 mm

(0.24in)

8 mm

(0.31in)

12 mm

(0.47in)

25 mm

(0.98in)

Aperture 2.0 2.0 2.0 2.0 2.5

Horizontal image angle 90° 60° 45° 31° 15°

Vertical image angle 67° 45° 34° 23° 11°

Distance 1 m (1.09yd) m m m m m

Image width 2.0 1.1 0.8 0.5 0.3

Image height 1.3 0.8 0.6 0.4 0.2

Distance 5 m (5.47yd) m m m m m

Image width 10.0 5.7 4.1 2.7 1.3

Image height 6.6 4.1 3.0 2.0 1.0

Distance 10 m (10.94yd) m m m m m

Image width 20.0 11.5 8.2 5.5 2.6

Image height 13.3 8.2 6.1 4.0 1.9

Distance 20 m (21.87yd) m m m m m

Image width 40.0 23.0 16.4 11.0 5.2

Image height 26.6 16.4 12.2 8.0 3.8

Distance 50 m (54.68yd) m m m m m

Image width 100.0 57.5 41.0 27.5 13.0

Image height 66.0 41.0 30.5 20.0 9.5

Notes

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 dierent sizes, converting the focal

lengths to 35mm camera as a known format allows the image formats and the

ﬁelds of vision of the dierent 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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Mobotix D24M-Sec User Manual Page 31

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