I am using shaved Nikon 10.5mm on full frame Nikon D610. I learned that a shaved Nikon 10.5mm on full frame Nikon D610 would give an FOV of 180 deg. I intend to buy the Ultimate R10 considering its portability. Since an FOV of 180 is exactly half of the whole sphere, I want the Ultimate R10 to have a static tilt upward in order to be assured of a perfect zenith stitch, but I want the resulting hole in the nadir as small as possible which I can easily patch up in Photoshop or cover with a logo. If any one of you have my set-up could you please give me advise of the optimal tilt upward of the Ultimate R10: 2.5 deg., 5 deg., 7.5 deg. or 10 deg.? Thanks in advance.