Lenses: Focal length vs. field of view
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Alvium G1 User Guide V1.1.1
About this chapter
This section presents tables that list selected fields of view (FOV) depending on
sensor size, distance, and focal length of the lens.
Parameters in tables
The distance to the object is measured from the first principal the plane of the lens
to the object. For some lenses, manufacturers do not define the principal plane
position. Production spread causes tolerances for all values, including actual focal
lengths. Calculations apply for image reproduction without distortion. Therefore,
values do not apply for fisheye lenses.
Please ask your Allied Vision Sales representative in case you need more
information.
Optical vignetting with certain lenses
Lenses with short focal lengths may show optical vignetting at the edges of the
image. Microlenses on the sensor pixels can increase the effect.
For demanding applications, we suggest testing camera and lens to find a suitable
setup. If you have questions, please contact your Allied Vision Sales representative.
Figure 42: Parameters used in tables for focal length versus FOV
Allied Vision S-Mount lenses
For technical data of Allied Vision S-Mount lenses with dedicated operating
instructions, see the S-Mount Lenses User Guide at
www.alliedvision.com/fileadmin/content/documents/products/accessories/lenses
/Allied_Vision/User_Guide/S-Mount-Lenses_User-Guide.pdf
Image distance
Sensor
size
Field of
view
Lens
Object distance
i
