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

  • IN STOCK & READY TO SHIP!!!
  • 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
  • Import Model 1 Yr Parts & 30 Day Labor Warranty via Seller  
AvailabilityIn stock
SKU
CN17404LEF
Condition
New
Manufacturer Price $799.00
$619.00
  • Canon 17-40mm f/4L EF USM Lens
  • E-77 II 77mm Lens Cap
  • Lens Dust Cap E (Rear)
  • EW-83E Lens Hood
  • Lens Case LP1319
  • 1yr Parts , 30 day Labor warranty by seller
Focal Length 17 - 40mm
Aperture Maximum: f/4
Minimum: f/22
Camera Mount Type Canon EF
Format Compatibility 35mm Film / Full-Frame Digital Sensor
Angle of View 104° - 57° 30'
Minimum Focus Distance 11.02" (28 cm)
Magnification 0.24x
Maximum Reproduction Ratio 1:4
Elements/Groups 12 / 9
Diaphragm Blades 7, Rounded
Focal Length 17 - 40mm
Aperture Maximum: f/4
Minimum: f/22
Camera Mount Type Canon EF
Format Compatibility 35mm Film / Full-Frame Digital Sensor
Angle of View 104° - 57° 30'
Minimum Focus Distance 11.02" (28 cm)
Magnification 0.24x
Maximum Reproduction Ratio 1:4
Elements/Groups 12 / 9
Diaphragm Blades 7, Rounded

The Canon 17-40mm f/4L  EF USM Lens is a high quality "L" series wide angle zoom lens for full frame and APS-C size DSLR cameras. It combines one high-precision molded glass aspherical element and two replica aspherical lenses to achieve the extended zoom range, while also correcting for common aberrations that arise during zooming. A Super UD (Ultra-low Dispersion) glass element minimizes the chromatic aberration of magnification which tends to occur with wide-angle lenses, to help eliminate color bleed along the edges of the subject and achieve high image contrast and resolution.

The lens' minimum focusing distance is just 11" (28cm) throughout its entire range of focal lengths, which makes it very useful for close-up work. All of the focusing and zooming action is done internally, with no changes in the size of the lens. Its ultrasonic autofocus motor enables smooth and silent autofocus action and manual focus override in One Shot AF mode allows precise manual focusing without switching into MF mode.

It only uses lead-free optics to help the environment, and features a circular diaphragm for improved background blur. The housing is water and dust resistant to help ensure reliable performance for both professionals and enthusiasts. Like many "L" lenses, it uses 77mm filters, but also has a rear gelatin filter slot behind the lens mount that can hold three gel filters.

This lens is a Canon 'EF' series lens, indicating it is for use with full-frame cameras. However, it also works with APS-C format DSLRs and offers a 35mm focal length equivalence of 27-64mm, making it an ideal medium-aperture standard zoom lens.