Vivotek has a camera, MD8562, which claims to have a horizontal field of view that is 110 degrees.
Given the specs on the camera, the sensor size is 1/2.7" with a fixed focal length of 2.8mm. Given Theia's lens calculator, they show 93 degrees. Other calculators and a formula I have for determining HFOV come up with appx. 87 degrees.
Why are these claims so obtuse? Is there something I am missing? Given everything I know about surveillance I find it hard to believe this camera actually has a 110 degree horizontal FOV.