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page contains different Field of View (FOV) examples for comparing and deciding
the lense you need.
Long range 25mm lens; Has a 13.3 degree field of view.
This means that at 100 feet away the camera will view approx. 18 ft. span from
left to right. You can recognize a persons face very easily at 100 feet in daylight.
In total darkness you will be able to see people walking at 100 feet away as well.
You will not be able to recognize a persons face 100 feet away in total darkness.
At 50 ft. away the viewing span is only 9 ft. At 25 ft. away the viewing span
is about 4 ft.
25mm | 
Door is 70 ft. away | 
Sign is 65 ft. away | 
Door is 53 ft. away, very dark night, taken with SSC-159C25 |
Medium range 12mm lens Has a 28 degree field of view.
This
means that at 100 feet away the camera will view. 35 ft. span from left to right,
at 50 ft. it will view approx. 18 ft. span. At 25 ft away it will view a 12 ft.
span. 
12mm | 
Door is 70 ft. away | 
Sign is 65 ft. away | 
Door is 53 ft. away, very dark night, taken with SSC-159C12 |
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 25 ft. away it will view about a 20 ft. span.
6mm | 
Door is 70 ft. away | 
Sign is 65 ft. away | 
Door is 53 ft. away, very dark night, taken with SSC-159C6 |
Short range 3.6mm lens Has a 92 degree FOV.
At 100 ft away
it will view about 140 ft span. At 50 ft. away it will view a 70 ft. span. At
25 ft. away, viewing span is about 35 ft.
3.6mm | 
Door is 70 ft. away | 
Sign is 65 ft. away | 
Door is 53 ft. away, very dark night, taken with SSC-159C36 |
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. In total darkness effective viewing with leds is about 25 ft.
2.97mm | 
Door is 70 ft. away | 
Sign is 65 ft. away | 
Door is 53 ft. away, very dark night, taken with SSC-159C29 |
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