Nikon Nikon 20mm f4 Heritage

Overview

The Nikon Nikkor 20mm f/4 AI is a compact manual-focus ultra-wide-angle lens produced in relatively small numbers, with fewer than 23,000 units made between 1974 and 1977 according to the reviews. Its defining characteristic and primary appeal is its remarkably small and light body, making it notably more compact than its larger-aperture 20mm siblings. It was aimed at landscape photographers, a segment where Nikon's 20mm lenses had long been favored. Because of its short production run and limited numbers, it carries some collector interest, but reviewers are candid that its optical performance is dated: one reviewer had to try three samples before finding one worth keeping, and concluded that modern zooms like the 14-24mm and 17-35mm outperform it 'without a doubt,' calling it an 'old dinosaur.' No established nickname or community jargon for this specific lens is evidenced in the reviews (unknown). People who love it do so for its size, weight, and the DOF/IR markings useful for infrared and hyperfocal shooting.

Verdict: The Nikon 20mm f/4 AI is a collector-friendly, ultra-compact ultra-wide for photographers who prize small size and light weight above outright image quality. It is soft in the corners wide open, prone to flare, and shows real light falloff on full frame, and it is decisively outperformed by modern wide zooms. But stopped down to f/8–f/11 it becomes usable, and its DOF/IR markings make it a charming tool for landscape and infrared shooters who enjoy working within its limits. Buy it for portability and character, not for clinical sharpness — and be prepared to sift through samples to find a good one.

Optical Character

Sharpness wide open

Very soft in the corners wide open at f/4, improving considerably by f/5.6 with peak performance at f/11.

Flare resistance

Prone to flare due to older coatings; listed explicitly as a drawback.

Contrast

unknown; flare tendency may reduce contrast but no explicit description given.

Vignetting

Noticeable light falloff, described as 'pretty bad' on full frame at f/4.

Community Insights

What people love

Small, light, and compact body — notably more compact than its 20mm siblings, at roughly 63.5mm x 35.5mm and 210g
Depth-of-field and infrared (IR) focus markings on the barrel, useful for hyperfocal and infrared work
Long-standing reputation of Nikon 20mm lenses among landscape photographers

What people dislike

Very soft corners wide open at f/4
Prone to flare due to older coatings
Significant light falloff/vignetting on full frame at wide apertures
Sample-to-sample variation — one reviewer needed three samples before finding a good copy
Outperformed by modern zooms like the 14-24mm f/2.8 and 17-35mm f/2.8
Second-hand price considered a drawback

Pro Tips

Stop down to at least f/5.6 to markedly improve sharpness over the soft f/4 corners
Use f/11 for peak overall performance according to the reviewer's testing
Use a lens hood (HN-14) to mitigate the lens's tendency to flare
Leverage the DOF and IR markings for hyperfocal focusing and infrared photography — IR performance was reported as good on newer/cleaner samples
Expect and compose around light falloff at wider apertures on full frame

Sample Photos

openverse · Credit: Jonathan Combe (Thank you for 400,000 views!) · License: CC BY

openverse · Credit: alexbrn · License: CC BY

openverse · Credit: pdsphil · License: CC BY

openverse · Credit: pdsphil · License: CC BY

openverse · Credit: pdsphil · License: CC BY

openverse · Credit: pdsphil · License: CC BY

Sources (1)

Web-grounded synthesissecondary

The Nikon Nikkor 20mm f/4 AI is a compact manual-focus ultra-wide-angle lens produced in relatively small numbers, with fewer than 23,000 units made between 1974 and 1977 according to the reviews. Its defining characteristic and primary appeal is its remarkably small and light body, making it notably more compact than its larger-aperture 20mm siblings. It was aimed at landscape photographers, a segment where Nikon's 20mm lenses had long been favored. Because of its short production run and limited numbers, it carries some collector interest, but reviewers are candid that its optical performance is dated: one reviewer had to try three samples before finding one worth keeping, and concluded that modern zooms like the 14-24mm and 17-35mm outperform it 'without a doubt,' calling it an 'old dinosaur.' No established nickname or community jargon for this specific lens is evidenced in the reviews (unknown). People who love it do so for its size, weight, and the DOF/IR markings useful for infrared and hyperfocal shooting.

https://www.momentcorp.com/review/nikon_20mm_f4_review.htmlhttps://jerfareza.camera/post/lens-review-nikon-20mm-afdhttps://www.thephoblographer.com/2014/11/08/review-nikon-20mm-f1-8g-ed/https://www.dslrbodies.com/lenses/nikon-lens-reviews/nikkor-prime-lens-reviews/nikon-20mm-f18g-lens-review.html