With a 180° angle of view the Nikon 16mm F2.8D AF Nikkor although classed as a fish-eye is actually an ultra wide as it gives full-frame coverage unlike a traditional fish-eye lens.

Specifications:

Focal Length: 16mm

Mount: Nikon F-Mount

Format: Full-frame 35mm

Max. Aperture: F2.8

Min. aperture: F22

Auto-Focus: Yes

Manual Focus: Yes

Focus limiter: No

Internal Focusing: Yes

Aperture Type: 7-bladed

Image Stabilisation: No

Filter Size: N/A

Angle of view: 180 (90º-61º DX format)

Min. Focus Distance: 25cm

Max reproduction ratio: 0:1

Weight: 290g

Length: 5.7cm

Included items:

Built-in lens hood

1x set front/rear lens caps

1x Lens pouch