03-25-2010, 05:00 PM
Note:
The 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 L22 on a 35 mm camera. This lens is thus called L22.
Since the image sensors in digital cameras have different sizes, converting to 35 mm camera as a known format provides for better comparing the image formats and the fields of vision of the different lenses. Another benefit is that you can easily set a 35 mm camera (analog or digital) to the same focal length (Lxx) to obtain the same field of vision. This approach greatly facilitates lens selection.