Quick answer
The Nikon Nikkor-UD 18mm f/4 AI-S is a ultra-wide prime lens covering 18mm at f/4.0 for the Nikon F mount. Its moderate maximum aperture works best in good light or with a higher ISO.
About this lens
The Nikon Nikkor-UD 18mm f/4 AI-S is a wide-angle prime lens covering 18mm at f/4 for Nikon F mount cameras. The wide view suits landscapes, architecture and environmental shots.
Nikon Nikkor-UD 18mm f/4 AI-S specifications
- Brand
- Nikon
- Mount
- Nikon F
- Focal length
- 18mm
- Maximum aperture
- f/4.0
- Lens type
- Prime
- Format coverage
- full-frame
- Optical construction
- 13 elements in 9 groups
- Autofocus motor
- none
- Minimum focus distance
- 0.3 m
- Filter thread
- 86 mm
- Weight
- 325 g
- Length
- 58.5 mm
- Diameter
- 89 mm
Specification source: en.wikipedia.org
What can you shoot with the Nikon Nikkor-UD 18mm f/4 AI-S?
At 18mm this is a ultra-wide prime, which typically suits:
- Landscapes and big skies
- Architecture and interiors
- Astrophotography and night skies
Its moderate maximum aperture works best in good light or with a higher ISO.
Full-frame equivalent and field of view
Calculated from the focal length and crop factor. Not measured.
| Sensor | Crop | Equivalent | Horizontal FOV | Diagonal FOV |
|---|---|---|---|---|
| Full frame | 1.0x | 18mm | 90° | 100.5° |
| APS-C | 1.5x | 27mm | 67.4° | 77.4° |
Frequently asked questions
What mount does the Nikon Nikkor-UD 18mm f/4 AI-S use?
It uses the Nikon F mount, so it fits Nikon F cameras directly.
What is the focal length of the Nikon Nikkor-UD 18mm f/4 AI-S?
It is a fixed 18mm lens with a maximum aperture of f/4.0. That makes it a ultra-wide lens.
Is the Nikon Nikkor-UD 18mm f/4 AI-S a prime or a zoom lens?
It is a prime lens with a fixed 18mm focal length. Primes usually open wider than zooms; this one opens to f/4.0.
What is the Nikon Nikkor-UD 18mm f/4 AI-S equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 27mm on full frame, with a 67.4° horizontal and 77.4° diagonal field of view. These figures are calculated from the focal length and crop factor.
Which cameras does the Nikon Nikkor-UD 18mm f/4 AI-S fit?
Any Nikon F-mount camera, including Nikon D3, Nikon D300, Nikon D3000, Nikon D300S, and Nikon D3100 and 35 more.
Alternatives for Nikon F from other brands
All Nikon F lensesSame mount, overlapping focal range, closest maximum aperture first.
