6mm Nikkor fisheye lens available at Clairmont Camera has an amazing
220 degree field of view! This means you could have the tripod and
the operators feet in the shot if you so desired while the lens is
pointing straight ahead in the normal position! It's T stop ranges
from T2.8 to T22 and it has a minimum focus of 9 inches. There is
a built in filter wheel giving you a choice of clear, 85, 85 ND.3,
85 ND.6 and 85 ND.9.