|EF||Autofocus lens designed both for Canon full frame and APS-C SLR cameras.|
|USM||The lens is equipped with ultrasonic motor to provide very fast and virtually silent autofocus. Learn more|
|Position in the lineup|
|Canon EF 20mm F/2.8 USM||Jun 1992||⊗|
|Canon FDn 20mm F/2.8||Dec 1979||⊗|
|Canon FD 20mm F/2.8 S.S.C.||Mar 1973||⊗|
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|Maximum format:||35mm full frame|
|Diagonal angle of view:||94.5° (35mm full frame)
80.8° (Canon APS-H)
68.4° (Canon APS-C)
|Lens construction:||11 elements in 9 groups|
|Closest focusing distance:||25 cm|
|Number of diaphragm blades:||6|
|Type of autofocus motor:||Ultrasonic (Canon EF)
|Full-Time Manual Focus:||Yes|
|Maximum diameter x Length:||Ø78 x 71 mm|
|Materials:||Metallic barrel, metallic mount|
|Filter size:||72 mm|
Design and Features
At the moment of beginning of production of this lens there already was Canon EF 20- 35mm F/2.8L (1989) in the company’s lineup - a professional wide-angle zoom with superb image quality and combination of focal length of 20 mm and aperture F/2.8 in its focal length range. Thus, at the first sight, the start of production of Canon EF 20mm F/2.8 USM was a bit questionable. However the lens has some obvious advantages over the mentioned above zoom:
- USM motor with FTM (20-35/2.8L only had AFD without FTM),
- a floating system,
- smaller closest focusing distance (0.25m compared to 0.5m),
- more compact and lightweight barrel.
The lens also nicely filled a gap between Canon EF 14mm F/2.8L USM (1991) and Canon EF 24mm F/2.8 (1988) – the difference in the field of view between 14 and 24 mm lenses is quite noticeable in the real life. If your specialty is mostly landscapes, then it may be worthwhile to consider buying this lens. But if you prefer travel photography, wide-angle zooms will serve you better.
The lens barrel is of moderate weight, made of metal. The lens mount is metallic.
The lens features AF/MF focus mode switch.
|AF||Autofocus mode with Full-Time Manual Focus.|
|MF||Manual focus mode.|
The lens uses front filters with standard size of 72 mm which are easy to find. However, filters of such size are more expensive and mainly used with professional lenses.
The filter thread does not rotate during focusing which allows convenient use of different types of filters (including but not limited to polarizing and gradient).
The lens is equipped with ultrasonic motor, the autofocus is virtually silent and very fast.
The lens incorporates a floating system that provides correction of aberrations and ensures constantly high image quality at the entire range of focusing distances from infinity down to the closest focusing distance. Learn more
The lens is very sharp at the center of the frame already wide open, the edges are good at F/2.8-4 and very good at subsequent apertures. The corners however are soft at all apertures.
|Camera||Canon EOS 5D mark II|
|Sensor size||36×24 mm|
|Vignetting at F/2.8||-3.59 EV|
|User Manual. Multilingual, Adobe PDF, 2 MB|
|Prime lenses for Canon EOS DSLR cameras|
Alternatives (AF, 17..23 mm)
|Sigma 20mm F/1.4 DG HSM | A||2015||⊗|
|Sigma 20mm F/1.8 EX DG Aspherical RF||2000||⊗|