The Canon EF 20mm f/2.8 USM Lens fits in a nice wide angle focal length space below the ultra-common 24-something and 28-something zoom lenses. There is a noticeable FOV (field of view) difference between 20mm and 24/28mm. People often look for a prime lens for their ultra wide angle needs.

Reasonably sharp wide-angle lens. There is slight red-green fringing, similar to 15 mm fisheye. Purple fringing is absent. Strong vignetting at f2.8-f4, but this goes away at f8 and higher. Good centre sharpness, but the corners are a bit soft at f2.8, and this improves by f5.6.

reasonably sharp; usm focus; excellent build quality; accepts 72 mm filters

vignetting; some CA; soft at f2.8

The focal length of this prime lens from Canon is on the edge of ultra wide angle when used on a full frame sensor or the 35mm film it was originally designed for. Even on a cropped sensor, it provides a good angle of coverage. We take a look at how it performs.

Good build and finish; Nice focal length on Full Frame cameras; Silent and fast autofocus; Good image quality

Not that useful on cropped sensors; Stiff manual focus ring (on example tested; Distortion worse than on modern designs (minor point; Hood not included with lens

This 20mm is very good optically, and has superb ergonomics for use with both 35mm and today's full-frame digital SLRs . Its mechanical quality is superior to most of Canon's lenses today, with a metal filter ring, metal hood mount and metal forebarrel.

Digital SLRs like the Canon D30/D60 have sensors that are smaller than a 24x36mm "35mm" frame, and t

Sharp; light; good flare control; minimal barrel distortion; ring USM motor

Lens hood must be bought separately

The focal length of this prime lens from Canon is on the edge of ultra wide angle when used on a full frame sensor or the 35mm film it was originally designed for. Even on a cropped sensor, it provides a good angle of coverage. We take a look at how it performs.

Good build and finish; Nice focal length on Full Frame cameras; Silent and fast autofocus; Good image quality

Not that useful on cropped sensors; Stiff manual focus ring (on example tested; Distortion worse than on modern designs (minor point; Hood not included with lens

awesome lense.

20mm prime lenses aren't overly popular anymore these days - most people prefer ultra-wide zoom lenses or prime lenses with an even more extreme focal length. However, consider me to be a relic. I think that 20mm is actually a sweet spot in this focal length class.

Canon EF 20mm f/2.8 USM is one of the oldest lenses in Canon's EF lineup, originally released in early 1992. And up until recently, this was the widest, non-fish-eye lens in Canon's arsenal (the company recently released an even wider lens - EF 14mm f/2.8L USM).

Agree with the other reviewer RE crops. I'm using this on a trip and with a 7D @ 18MP I get fantastic 100% crops. This is a great landscape lens and I think a great buy if you can deal with primes.

Sharpness; fast AF; color; contrast

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