i had thermal camera with 100 mm lens, they write on it that field of view 6.2 deg. H * 5 deg. V. i need to know distance can cover and the dead area, as i need to put 3 of it at boundary of a building.
I am sorry that we do not carry thermal cameras at this time so our knowledge in this area is limited. If the camera uses a 1/3" sensor, you can use this lens chart: