The Specs

Optics
Max Focal Length 40 mm
Min Focal Length 17 mm
Min Focus Distance 11 in
Max Aperture f/ 4 (Wide)
Filter Size Supported 77 mm
Additional Specifications
Angle of View 104 to 57.5 degrees
Minimum Aperture 22 1/f
Max Aperture at Min Focal Length F/4
Maximum Aperture 4 1/f
Min Aperture Value F/22
Quick Glance
Max Focal Length 40 mm
Lens Type Wide Angle
Max Aperture f/ 4 (Wide)
Compatible Camera Mount Canon EOS Cameras
Other Features
Included Components Lens Hood
Usage Information
Lens Type Wide Angle
Compatible Camera Mount Canon EOS Cameras
Warranty
Warranty Information 1 Year Limited Warranty
More Info
URL http://www.usa.canon.com
Physical Specifications
Diameter 3.3 in
Weight 1.1 lbs
Length 3.8 in

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