Is it possible to get 12ft wide image from a 3ft distance?
I am a beginner and have very little knowledge on the field of view of cameras.
I calculated that a Go Pro would need a lens with 1.5mm focal length to achieve this using a calculator on this page: http://www.tawbaware.com/maxlyons/calc.htm
A DSLR would need aproximatly 5mm focal length lens to achieve this.
Am I getting the correct results?