FOV is for VIDEO ONLY! (and even then, only for 1080 modes). There is no FOV setting for still photos.
The unfortunately-misnamed "Size" setting is for still photos. But all it really does is change the ASPECT RATIO. Photos on the P2V camera are always 4384 pixels wide. The "Size" setting just crops the picture vertically to give you different aspect ratios, eg 4:3, 3:2, 16:9. The "Size" setting SHOULD have been named "Photo Aspect Ratio". Most people mistakenly think it has something to do with JPEG quality.