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
TheEF 17-40mm f/4L USM LensfromCanonis 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 asphericalelement 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.
Thelens' 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 changesin 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 offersa 35mm focal length equivalence of 27-64mm, making it an ideal medium-aperture standard zoom lens.
A super wide-angle zoom lens for full-frame DSLR and 35mm film cameras that offers a 27-64mm focal length equivalent when used on APS-c size sensors.
Uses three aspherical lens elements and Canon Super UD ultra-low dispersion glass for reduced aberrations and overall sharp, high contrast imaging
An ultrasonic autofocus motor provides fast, smooth and quiet AF action, particularly important when shooting video.
Manual focus override enables precise manual focusing even when in One Shot AF mode.
Internal zooming and focusing systems
As a Canon "L" series lens it provides professional levels of moisture and dust resistance.
Circular aperture diaphragm for better, more natural looking background blurring
Accepts 77mm filters, as well as gelatin filters at the rear of the lens.
77mm High Resolution Protective UV Filter
77mm Professional Close-Up Filter Set w/+1 +2 +4 +10 Macro Lenses
77mm Hoya Circular Polarizer High Quality Glass Filter
77mm Hoya Circular Polarizer Multi Coated Glass Filter (HMC)
77mm Professional High Resolution Three Piece Filter Kit
77mm Multi-Coated Circular Polarizer Filter - High Resolution
Tiffen 77mm UV Protector Filter
Multi Coated UV Glass Filter (Any Size) & 8 PC Camera Lens Cleaning Kit
2 Year Lens Warranty (ACCIDENTAL) LNS2-500A
5 Year Lens Warranty LNS5-500
5 Year Lens Warranty (ACCIDENTAL) LNS5-500A
Lowepro Lens Case 9 x 13cm (Black)
ZEISS Lens Cleaning Kit
Purosol PUOC-10078 Optical Lens Cleaning Small Kit
Sensei Cap Keeper Lens Cap Holder
HUFA S Clip Lens Cap Clip (Black)
Sensei Clip-On Cap Keeper
Dot Line Cap Holder
Vello Auto Lens Adapter for Canon EF/EF-S Lens to Canon EOS M Camera System
Vello Canon EF/EF-S Lens to C Mount Camera Adapter
2 Year Lens Warranty LNS2-500
Ruggard 19 x 19" Padded Equipment Wrap (Black)
Capturing Couture Fall Rose Cap Saver (Red)
Capturing Couture Spring Rose Cap Saver (White)
Capturing Couture Spring Rose Cap Saver (Hot Pink)
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