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You're reviewing: Canon EF 17-40mm f/4 L USM Ultra Wide Angle Lens

  • Canon EF 17-40mm f/4 L USM Ultra Wide Angle Lens

Canon EF 17-40mm f/4 L USM Ultra Wide Angle Lens

EF Mount L-Series Lens
Aperture Range: f/4-22
Three Aspherical Elements, One Super UD
Ultrasonic Autofocus Motor
Manual Focus Override
Water and Dust Resistant<
Internal Zooming and Focusing
Truly Circular Diaphragm
77mm Front Filter Diameter
Rear Holder for Three Gel Filters

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description

In addition, the lens focuses as close as 11 inches ( 0.28 mm ) and offers both Canon's full-time manual focus and a powerful ultrasound monitor ( USM ) ring , which are a fast and quiet autofocus produziert.Weitere features a constant f / 4 maximum aperture , the choice of Screw - 77mm filters or a holder in the rear of the lens for up to three gel filters and optical coatings optimized for use with digital cameras . With weather-resistant and similar to other high-end L - Series cameras , the lens carries a one year warranty .

specs

General
Lens TypeZoom lens
Lens ModelCanon EF 17-40mm F/4 L USM
Focal Length17–40 mm
Maximum ApertureF4
Minimum ApertureF22
Camera Mount TypeCanon EF
Minimum Focus Distance11.02" (28 cm)
Magnification0.24x
Format Compatibility35mm Film / Full-Frame Digital Sensor Canon (APS-C)
Angle of View104° - 57° 30'
Maximum Reproduction Ratio1:4
Elements/Groups12/9
Diaphragm Blades7
Features
Image StabilizationNo
AutofocusYes
Tripod CollarNo
Physical
Weight1.05 lb (475 g)
DimensionsApprox. 3.29 x 3.81" (83.5 x 96.8 mm)
Filter ThreadFront:77 mm Rear:
ColorBlack