|
Home >> Tools & Resources >> FOV Help
Help and Explanation
FOV Calculator Tool and Distance Chart
Below are sample pictures taken with different mm lenses
at different distances to further assist you in selecting the best lens mm for
your application. 3.6mm is by far the most common lens sold in surveillance cameras.
All same mm lens cameras will vary slight with the field of view (FOV) depending
on that particular manufacturer. The way a camera is actually built will have
a direct impact on the degree of field of view. The calculator above will not
give exact measurements for any camera. Just a very close approximation.
Certain other points to keep in mind are
1. The actual picture size will vary depending on whether you are viewing full screen on a TV or smaller screen on pc monitors using dvr software.
2. These pictures are in daylight. Night time viewing will vary significantly depending on the exact camera you purchase and how many LEDS are on the camera.
3. These very old pictures below were taken with our 400 lines of resolution 159 series camera. This means the camera you purchase today will more than likely be higher than 400 lines.
This means that at 100 feet away the camera will view approx. 19.2 ft. span from left to right.
 25mm |  Sign is 65 ft. away |
Medium range 12mm lens
Has a 28 degree field of view.
This means that at 100 feet away the camera
will view. 40 ft. span from left to right,
at 50 ft. it will view approx.
20 ft. span. At 25 ft away it will view a 10 ft. span.
 12mm |  Sign is 65 ft. away |
Medium range 6mm lens
Has a 53 degree field of view.
This means that at 100 away it will view about
80 ft span. At 50 ft. it will view approx.
40 ft. span. At 20 ft. away it
will view about a 20 ft. span.
 6mm |  Sign is 65 ft. away |
Most popular range
is the 3.6mm lens which has a 92 degree FOV.
At 100 ft away it will view about
133 ft span. At 50 ft. away it will view a
66 ft. span. At 25 ft. away, viewing
span is about 33 ft.
 3.6mm |  Sign is 65 ft. away |
Short range 2.97mm
lens Has a 130 degree FOV. At 25 ft. away, viewing span
is about 55 ft. and
at 65 ft. distance, viewing span is about 120 ft.
 2.97mm |  Sign is 65 ft. away |
Cameras come with different lenses and this different lenses provide different FOVs (field of views). Depending on the lens on your camera, you may get a very narrow or a very wide FOV. The smaller the mm of the lens the wider of field of view. The larger the mm lens the narrower the field of view.
