Lens · prime
Nikkor 18mm f/3.5 AI-S
Nikon · 1981-2005
Discontinued35mm
Extreme ultra-wide rectilinear perspective. 100-degree field of view while maintaining straight lines. 11-element design with CRC for close-focus capability. Nikkor 18mm f/3.5 AI-S: 11 elements in 10 groups, 7 aperture blades, 0.25m minimum focus, 72mm filter thread, 350g.
- Focal length
- 18mm
- Max aperture
- f/3.5
- Mount
- Nikon F
- Format
- 35mm
- Elements / groups
- 11 / 10
Known for
- Extreme wide landscapes
- Architecture interiors
- Real estate
- Dramatic perspectives
Considerations
- Significant distortion
- Complex to master
Optical characteristics
Silverlog's editorial rating: our own judgement, not measured data.
Sharpness (wide)3, level 3 of 5
Sharpness (stopped)4, level 4 of 5
Contrast4, level 4 of 5
Flare resistance3, level 3 of 5
CA control3, level 3 of 5
Vignetting control3, level 3 of 5
Distortion control3, level 3 of 5
Bokeh: Not relevant at this focal length
Rendering: Ultra-wide perspective, some distortion
Colour: Neutral
Silverlog's editorial rating, 1 to 5; five is best. Not lab-measured.
Common issues
- CRC mechanism wear
- Front element scratches
Buying guide
Check CRC mechanism works smoothly. Check whether the separate HK-9 hood is included.
Specifications
| Mount | Nikon F |
| Focal Length | 18mm |
| Max Aperture | f/3.5 |
| Min Aperture | f/22 |
| Aperture Blades | 7 |
| Min Focus | 0.25m |
| Filter Size | 72mm |
| Weight | 350g |
Optical design
| Formula | Retrofocus |
| Elements | 11 |
| Groups | 10 |
| Coating | NIC (Nikon) |
| Special | CRC (Close Range Correction) |
Pricing
- Typical used price
- £350 - £500
- Mint
- ~£650
Indicative, no dated source.