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Black cylindrical zoom lens with red ring and 77mm filter thread

Canon

Canon EF 17-40mm f/4L USM camera lens

SKU CH-YJMT-7G915

Ultra-wide zoom covering 17-40 mm at constant f/4 with ring-type USM focusing, weather-resistant build and 77 mm filter thread

  • TypeZoom Lens
  • Ultra-wide 17-40mm zoom captures expansive scenes
  • Constant f/4 aperture maintains exposure throughout zoom range
  • Ring-type USM motor delivers fast, silent autofocus
  • Weather-resistant build with 77mm filter thread for durability

Ultra-wide zoom for Canon SLR

The Canon EF 17-40mm f/4L USM is an ultra-wide-angle zoom lens built for Canon SLR cameras. It covers a 17-40mm focal range with a constant f/4 maximum aperture. Three aspherical elements and a Super UD glass element correct aberrations across the frame. A ring-type USM motor delivers fast and silent autofocus performance.

Close focus and filter limits

The lens focuses as close as 11 inches for near-subject detail. It accepts screw-in 77mm filters or up to three gel filters for creative control. Weather-resistant construction helps protect against dust and moisture during outdoor use. The barrel measures 3.3 inches in diameter, which determines filter compatibility and hood options.

Highlights

  • Ultra-wide 17-40mm zoom captures expansive scenes
  • Constant f/4 aperture maintains exposure throughout zoom range
  • Ring-type USM motor delivers fast, silent autofocus
  • Weather-resistant build with 77mm filter thread for durability

Specifications

BrandCanon International
TypeZoom Lens

Questions about this item

Should I choose the 17-40mm f/4L USM or a different focal range?

This lens covers an ultra-wide 17-40mm zoom range with constant f/4 aperture, suited to wedding and nature photography where expansive scenes are common.

What does the 11-inch close-focus distance mean when I am shooting?

You can focus as close as 11 inches from the subject, allowing detailed foreground elements while retaining the wide-angle perspective.

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