Canon Canon 20mm f2.8 Heritage

เรื่องราวของเลนส์

The Canon 20mm f/2.8 in FD mount traces to Canon's ultra-wide FD lineup that began with the FD 20mm f/2.8 S.S.C. released in March 1973, one of the first serious ultra-wide primes Canon offered. The S.S.C. designation refers to Canon's Super Spectra Coating, a high-grade multi-coating introduced in the early 1970s to reduce flare and ghosting and to improve contrast, color rendering, and light transmission over the standard S.C. coating. The design was later carried into the New FD (NFD) era, with the Canon New FD 20mm f/2.8 arriving in 1979 as a lighter, restyled evolution (9 groups / 10 elements, 305g). Notably, Canon never gave the 20mm the aspherical (ASPH) treatment that made siblings like the FD 24mm f/1.4 S.S.C. ASPH so rare and expensive, which kept the 20mm relatively affordable. No established nickname exists for this lens. Its cult following rests on being an affordable, lightweight, fast (f/2.8) ultra-wide with excellent sharpness and pleasing, slightly vintage rendering that adapts beautifully to modern mirrorless bodies like the Sony A7.

สรุป: The Canon FD 20mm f/2.8 is an affordable, lightweight, and genuinely sharp ultra-wide that punches above its price. It's ideal for landscape and architecture shooters who work stopped down, film enthusiasts wanting a fast wide with slightly vintage rendering, and mirrorless adapters seeking a characterful ultra-wide. Just accept the minor moustache distortion and the large 72mm filter thread as the price of admission.

คาแรกเตอร์ของภาพ

โบเก้

ค่อนข้างดีสำหรับเลนส์อัลตร้าไวด์ ให้ภาพที่น่าพอใจเป็นพิเศษเมื่อฉากหลังไม่ซับซ้อนหรือไม่รก

โทนสี

ให้การถ่ายทอดสีที่น่าพอใจ พร้อมความรู้สึกวินเทจเล็กน้อย โดยการเคลือบ S.S.C. ช่วยเสริม

ความคม (เปิดสุด)

โดยรวมให้ความคมมาก โดยเฉพาะความคมบริเวณมุมภาพจะยอดเยี่ยมเมื่อหรี่รูรับแสง (f/8–16); ที่เปิดรูรับแสงกว้างสุดให้ความคมที่ยอมรับได้แต่ค่อนข้างนุ่มกว่า

แฟลร์

แฟลร์เป็นเรื่องปกติสำหรับทางยาวโฟกัสนี้ — การเคลือบ S.S.C. ถูกออกแบบมาเพื่อลดทั้งแฟลร์และโกสต์ (ghosting)

คอนทราสต์

มีรายงานว่าคอนทราสต์ยอดเยี่ยม โดยเฉพาะเมื่อใช้รูรับแสงแคบ ซึ่งเชื่อว่าเป็นผลจากการเคลือบหลายชั้นแบบ S.S.C.

รีวิวจากผู้ใช้

ข้อดี

Very sharp with excellent contrast and overall image quality, especially for landscapes stopped down to f/8-16
Affordable ultra-wide entry point (roughly $250-$350), making it a great starter UWA
Lightweight yet well built, and fast at f/2.8 for a wide angle
Pleasing rendering with a slightly vintage color character and surprisingly nice bokeh for an ultra-wide
Adapts excellently to modern mirrorless bodies like the Sony A7 and A7-series, performing well even on full-frame digital
S.S.C. Super Spectra Coating gives good color rendering and contrast

ข้อเสีย

Minor moustache distortion
Large 72mm filter thread that some feel is unnecessarily big for the focal length and adds bulk/cost of filters
Softer performance and coma/very minor smear wide open, making it less ideal for astrophotography unless stopped down
Lacks the built-in filters of the 15mm f/2.8, forcing users to carry multiple 72mm filters
No aspherical version was ever made

เทคนิคการใช้

Stop down to f/8-f/16 for peak sharpness and corner-to-corner performance in landscapes and architecture
For astrophotography, stop down to control coma and the very minor smear seen wide open
Adapts well to mirrorless (e.g. Sony A7) via FD adapter for full-frame use
Pair it with color-shifting film like Lomochrome Purple or Turquoise for creative ultra-wide looks
Budget for a set of 72mm filters since it lacks built-in filters

แหล่งอ้างอิง (1)

Web-grounded synthesissecondary

The Canon 20mm f/2.8 in FD mount traces to Canon's ultra-wide FD lineup that began with the FD 20mm f/2.8 S.S.C. released in March 1973, one of the first serious ultra-wide primes Canon offered. The S.S.C. designation refers to Canon's Super Spectra Coating, a high-grade multi-coating introduced in the early 1970s to reduce flare and ghosting and to improve contrast, color rendering, and light transmission over the standard S.C. coating. The design was later carried into the New FD (NFD) era, with the Canon New FD 20mm f/2.8 arriving in 1979 as a lighter, restyled evolution (9 groups / 10 elements, 305g). Notably, Canon never gave the 20mm the aspherical (ASPH) treatment that made siblings like the FD 24mm f/1.4 S.S.C. ASPH so rare and expensive, which kept the 20mm relatively affordable. No established nickname exists for this lens. Its cult following rests on being an affordable, lightweight, fast (f/2.8) ultra-wide with excellent sharpness and pleasing, slightly vintage rendering that adapts beautifully to modern mirrorless bodies like the Sony A7.

https://www.canonclassics.com/canon-nfd-20mm-f2.8/10-60/https://www.canonrumors.com/a-history-lesson-on-canon-20mm-lenses/https://www.kenrockwell.com/canon/lenses/20mm.htmhttps://www.the-digital-picture.com/Reviews/Canon-EF-20mm-f-2.8-USM-Lens-Review.aspx