fov is wrong on pinhole camera when yres is less than xres

[alexc9]

for example in the materialtest scene, if you render with a 1000,1000 resolution you get a different fov compared to the default resolution of 1000,563.

[tunabrain]

FOV is currently a bit odd in tungsten. In theory it should be horizontal FOV, but as you mentioned that's not true for all resolutions.

I'll investigate and try to figure out the best solution. Thanks for reporting this!