Walimex Pro 8mm T3.8 UMC CS Fisheye II - Nikon Fit

The aperture ranges from T3.8 to T22. T3.8 being its fastest aperture, this lens is best used in environments with sufficient light or with a light source incorporated. The aperture is manually adjustable without click stops with a continuous, smooth aperture ring. Both the aperture ring and focus ring feature a 0.8 gear pitch in case you want to use a follow focus with either. The focus ring is also well-damped and very smooth. The lens doesn't offer auto-focus, but in fish-eye lenses objects appear mostly in focus anyway.