Canon EF 17-40mm f/4L USM

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The 17-40mm f/4L USM, like all of the Canon "L" lenses, delivers optical performance equal to similar fixed focal length lenses, with silent, high-speed focusing. Distortions and aberrations are remarkably small for a lens of such focal range.

The 17-40's 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 of the size of the lens.

Canon EF 17-40mm f/4L USM
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  • Filter Size: 77mm (accepts up to three gel filters on rear slot)
  • f/Stop Range: 4-22
  • Minimum Focus Distance: 11" (28 cm)
 

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