The field of view or image displayed on your TV or monitor
varies depending on the size of your cameras image sensor e.g.(1/4",
1/3", 1/2") and the lens size used e.g.(4mm, 6mm etc.). This calculator
can help give you a better idea of the correct lens size you will need
to obtain your desired field of view.
The larger the lens the more detail
you can see at a particular distance but your field of view will be
smaller. It is similar to looking through stronger and stronger
binoculars. The 3.6mm lens is very popular since it provides good
overall coverage and a wide field of view, however if your goal is to
get facial details of someone at a distance greater than 20 to 25 feet
away you would need a larger lens in the camera, possibly a 6mm or
8mm. So you need to decide what your viewing goal is and
whether one camera will be adequate or if you need 2 or more.
camera sensor size you are using.
Enter any 2 of
the 3 other pieces of
"Calculate" button to
get the missing piece of information. (Press the "Reset" button to
form and start over.)