The Canon EF 16-35mm f/4L IS USM is an advanced wide-angle zoom lens in Canon's L Series - a professional grade level of optics that every consumer can benefit from.  This lens incorporates an Optical Image Stabilizer, along with up to four stops of correction for admirable performance even in challenging light conditions. It features three aspheric lens elements and two UD lens elements to minimize aberrations throughout the zoom range, plus optimized coatings to help minimize ghosting.

CANON L SERIES

The L Series denotes Canon's professional line of lenses.  Though used extensively by non-professionals, these lens have been engineered to the highest of standards.  These luxury lenses incorporate such advanced optical advantages as Super Low Dispersion Glass, Ultra-Low Dispersion Glass, flourite elements and aspherical design elements.  All of these combine to produce reliably incredible images.

ULTRA SONIC MOTOR (USM)

Canon's USM lenses employ a motor powered by ultrasonic waves that produce a quiet, yet high-speed AutoFocus. You can enjoy high performance with low noise in a variety of shooting situations.

ULTRA LOW DISPERSION GLASS (UD)

Canon's Low Dispersion technology is engineered to reduce chromatic aberrations, eliminating the tendency of light of different colors to focus to different points at the image plane.  This means your images will come out crisp and clear, with less of a chance of defracting light into an unwanted rainbow of colors.  Take shots exactly like you want, without any flare-up or blurring.

INTERNAL FOCUSING (IF)

Internal Focusing lenses ensure maximum stability by moving the inner lens groups when focusing.  This allows the lens physical length to remain constant while achieving perfect focus.

ASPHERICAL DESIGN

Canon's aspherical lens design creates a more complex surface profile.  This helps to greatly reduce spherical and other optical aberrations.  The design further ensures consistent imaging performance throughout the entire focal range, while delivering incredible sharpness up to the periphery of the image. 

MANUAL FOCUS

Manual focusing means you have all the control at the end of your fingers.  Canon lenses feature a specially designed ergonomic construction that is noticeable at first touch.  The large rotation angle of this lens guarantees precise focusing.  The mechanism moves super smoothly and without extra play, furthering the intuitive interaction along the focal plane.  

ANTI-REFLECTIVE COATING

The Canon anti-reflective coating is an optical design feature which ensures superior clarity and image brilliance, even in poor or unfavorable lighting conditions.  Canon applies the anti-reflective coating through a special process, layering the lens surface in order to substantially reduce unwanted flare or ghosting.  This process helps to ensure incredibly rich image contrast and true color fidelity.  Canon L Series lenses feature a fluorine coating on the front and rear surfaces.  This coating helps to greatly reduce smears, smudges or fingerprints ensuring that you will always take impeccable images. 

OPTICAL IMAGE STABILIZATION (IS)

Featuring Optical Stabilization technology, a feature that employs an innate, built-in mechanism in order to compensate for camera shake.  By eliminating natural shakes and sways with camera movement your images will come out crisp and clean every time.