Nikon Nikon 20mm f4 Heritage

เรื่องราวของเลนส์

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.

สรุป: 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.

คาแรกเตอร์ของภาพ

ความคม (เปิดสุด)

มุมภาพค่อนข้างนุ่มเมื่อเปิดรูรับแสงกว้างสุดที่ f/4, ดีขึ้นอย่างมากที่ f/5.6 และให้ความคมสูงสุดที่ f/11.

แฟลร์

มีแนวโน้มจะเกิดแสงแฟลร์เนื่องจากการเคลือบเลนส์แบบเก่า; ระบุไว้อย่างชัดเจนว่าเป็นข้อเสีย

คอนทราสต์

ไม่ระบุ; มีแนวโน้มเกิดแฟลร์ซึ่งอาจลดความเปรียบต่าง แต่ไม่มีคำอธิบายอย่างชัดเจน

วิกเน็ตติ้ง

มีแสงตกมุม (vignetting) ที่สังเกตได้ — ค่อนข้างรุนแรงบนเซ็นเซอร์ฟูลเฟรมที่ค่า f/4

รีวิวจากผู้ใช้

ข้อดี

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

ข้อเสีย

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

เทคนิคการใช้

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

ภาพตัวอย่าง

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openverse · เครดิต: pdsphil · ลิขสิทธิ์: CC BY

openverse · เครดิต: pdsphil · ลิขสิทธิ์: CC BY

แหล่งอ้างอิง (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