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Canon EF 17-40mm f/4L USM Instruction

Ultrasonic ef lens
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EF17-40mm f/4L USM



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  Summary of Contents for Canon EF 17-40mm f/4L USM

  • Page 1 EF17-40mm f/4L USM Instruction...
  • Page 2 Thank you for purchasing a Canon product. The Canon EF17-40mm f/4L USM is a high- performance wide-angle zoom lens. • “USM” stands for Ultrasonic Motor. Conventions used in this instruction Warning to prevent lens or camera malfunction or damage. Supplementary notes on using the lens and taking pictures.
  • Page 3: Safety Precautions

    a Safety Precautions a Safety Precautions • Do not look at the sun or a bright light source through the lens or camera. Doing so could result in loss of vision. Looking at the sun directly through the lens is especially hazardous. •...
  • Page 4: Table Of Contents

    Nomenclature Focus mode switch (→ 5) Hood mount (→ 7) Distance scale (→ 6) Zoom ring (→ 5) Gelatin filter holder (→ 8) Filter mounting thread (→ 7) Contacts (→ 4) Focusing ring (→ 5) Lens mount index (→ 4) For detailed information, reference page numbers are provided in parentheses (→...
  • Page 5: Contacts

    The lens mount has a rubber ring for enhanced water- and dust-resistance. The rubber ring may cause slight abrasions around the camera's lens mount, but this will not cause any problems. If the rubber ring becomes worn, it is replaceable by a Canon Service Center at cost. ENG-4...
  • Page 6: Focusing Ring

    2. Setting the Focus Mode To shoot in autofocus (AF) mode, set the focus mode switch to AF. To use only manual focusing (MF), set the focus mode switch to MF, and focus by turning the focusing ring. The focusing ring always works, regardless of the focus mode.
  • Page 7: Distance Scale

    4. Infinity Compensation Mark Infinity compensation mark Distance index To compensate for shifting of the infinity focus point that results from changes in temperature. The infinity position at normal temperature is the point at which the vertical line of the L mark is aligned with the distance indicator on the distance scale.
  • Page 8: Filter Mounting Thread

    • To ensure dust- and water-resistant performance, attach a Canon PROTECT filter (77mm). • Only one filter may be attached. • If you need a polarizing filter, use the Canon Circular Polarizing Filter (77mm). ENG-7...
  • Page 9: Gelatin Filter Holder

    8. Filter Holder There is a gelatin filter holder at the rear of the lens. Cut the gelatin filter to fit within the white frames. Then insert the gelatin filter into the filter holder. • Only one filter can be used. •...
  • Page 10 10. Close-up Lenses (Sold separately) Attaching a 500D (77mm) Close-up Lens enables close-up photography. The magnification will be as follows: • Can be used at the 40mm end (magnification 0.30x - 0.08x) • Close-up Lens 250D cannot be attached because there is no size that fits the lens. •...
  • Page 11: Specifications

    • The EF1.4X II/EF2X II extenders cannot be used with this lens. • Aperture settings are specified on the camera. • All data listed is measured according to Canon standards. • Product specifications and appearance are subject to change without notice.
  • Page 12 CT1-7546-006 © CANON INC. 2003 2009.7...