Tuesday, December 8, 2009

Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens for Canon SLR Cameras

Broaden your perspective with the Canon EF 17-40mm ultra-wide-angle zoom lens. Ideal for both film and digital SLR cameras, the lens offers three aspherical lens elements in addition to a Super UD (ultra-low dispersion) glass element, creating superior optics in all conditions. In addition, the lens focuses as close as 11 inches (0.28mm), and offers both Canon's full-time manual focus and a powerful ring-type ultra-sonic monitor (USM) that produces fast and silent autofocus. Other features include a constant f/4 maximum aperture, the choice of screw-in 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. Boasting weather-resistant construction similar to other high-end L-series cameras, the lens carries a one-year warranty.

  • Focal length: 17-40mm
  • Maximum aperture: 1:4
  • Lens construction: 12 elements in 9 groups
  • Diagonal angle of view: 104 to 57 degrees (at 30 feet)
  • Focus adjustment: Inner focusing system with USM
  • Closest focusing distance: 0.9 feet
  • Zoom system: Rotating type
  • Filter size: 77mm
  • Dimensions: 3.3 inches in diameter, 3.8 inches long
  • Weight: 1.1 pounds


Customer Review: VERY VERY pleased... WOW

I'll just let the photo's I took do the talking, I took some of my Fender Stratocaster (see most recent photo's)... The lense is amazing, my company is doing product shots now and I bought this lens s...

Customer Review: It's really nice, but...

this lens is my first L, and i was hoping to be blown away. perhaps that was my own mistake for setting my expectations too high. don't get me wrong, it's a great lens, and it does everything i need i...
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