I just found this thread, it's just what I was waiting for! I ordered one camera to try it out last night.
Originally Posted by carl1864
I just did some pretty accurate tests of the new HD camera's field of view with various lenses, as well as the old #3 camera's field of view for comparison, using a protractor setup.
I tested them stock, with the .67x lens, and with the 180 fish eye lens, and here are the results.
wide ------------ tall
54 degrees ____ 32 degrees _______ stock, no lens
77 degrees ____ 45 degrees _______ .67x lens
129 degrees ____ 67 degrees _______ 180 fish eye lens
wide ------------- tall
37 degrees ____ 28 degrees _______ stock, no lens
53 degrees ____ 39 degrees _______ .67x lens
77 degrees ____ 57 degrees _______ 180 fish eye lens
I would say a 90 degree field of view would be optimal; I got a bit lost in the thread but didn't someone contact the manufacturer already over some firmware issues? It would be good to contact again to ask about having an even wider lens on the camera, or even better being able to buy different lens sizes.