Canon EF 20mm lens

Canon EF 20 mm lens
Technical data

Maker	Canon
Type	wide-angle prime lens
Focus drive	Ultrasonic motor
Focal length	20 mm
Crop factor	1.0
Aperture (max/min)	f/ 2.8 - f/ 22
Close focus distance	0.25 m (0.82 ft)
Max. magnification	0.14x
Diaphragm blades	6^[1]^[2]
Construction	11 elements / 9 groups
Features
Short back focus	No
Lens-based stabilization	No
Macro capable	No
Application	interiors, reportage, general
Physical
Max. length	70.6 mm (2.78 in)
Diameter	77.5 mm (3.05 in)
Weight	405 g (14.3 oz)
Filter diameter	72 mm
Accessories
Lens hood	EW-75II
Angle of view
Horizontal	84°
Vertical	62°
Diagonal	94°
History
Introduction	June 1992
Retail info
MSRP	75,000 yen USD

The Canon EF 20 mm f/2.8 USM lens is an ultra-wide-angle prime lens produced by Canon for the EF lens mount. It features an ultrasonic motor. On a camera with an APS-C sensor the focal length is equivalent to 32 mm, and it is classified as a wide-lens. It features a ring-type USM motor featuring full time manual and a fixed front element. The optical scheme of the lens includes eleven element in nine groups without any special lens. The performances are considered good, but not enough to compete with modern prime lenses; some zoom lenses from the Canon L series offer similar performances.

References

↑ Canon Inc. "EF20mm f/2.8 USM". Retrieved 2016-03-10.
↑ http://slrgear.com/reviews/showproduct.php/product/80/cat/10

External links

Wikimedia Commons has media related to Canon EF 20mm F2.8L USM.

Canon museum

Canon EF/EF-S/EF-M lenses

EF-S zoom	EF-S 10–18mm EF-S 10–22mm EF-S 15–85mm EF-S 17–55mm EF-S 17–85mm EF-S 18–55mm EF-S 18–135mm EF-S 18–200mm EF-S 55–250mm

Ultra-wide zoom	EF 11–24mm EF 16–35mm EF 17–40mm

Standard zoom	EF 24–70mm EF 24–105mm EF 28–135mm EF 28–300mm

Telephoto zoom	EF 70–200mm EF 70–300mm EF 75–300mm EF 100–400mm EF 200–400mm

Wide-angle prime	EF 14mm EF 20mm EF 24mm EF-S 24mm EF 28mm EF 35mm

Standard prime	EF 40mm EF 50mm

Telephoto prime	EF 85mm EF 100mm EF 135mm EF 200mm

Super telephoto prime	EF 300mm EF 400mm EF 500mm EF 600mm EF 800mm

Distorting lenses	EF 8–15mm Fisheye EF 135mm with Softfocus

Tilt-shift	TS-E 17mm TS-E 24mm TS-E 45mm TS-E 90mm

Macro	EF 50mm Compact Macro EF-S 60mm Macro MP-E 65mm 1–5x Macro EF 100mm Macro EF 180mm Macro

EF-M zoom	EF-M 11–22mm EF-M 15–45mm EF-M 18–55mm EF-M 55-200mm

EF-M prime	EF-M 22mm

Lens accessories	Extender EF

Discontinued zoom	EF 17–35mm EF 20–35mm EF 22–55mm EF 24–85mm EF 28–70mm EF 28–80mm EF 28–90mm EF 28–105mm EF 28–200mm EF 35–80mm EF 35–105mm EF 35–350mm EF 55–200mm EF 70–210mm EF 80–200mm EF 90–300mm EF 100–200mm EF 100–300mm

Discontinued prime	EF 15mm Fisheye EF 1200mm

This article is issued from Wikipedia - version of the Thursday, March 10, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.