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EF17-40mm f/4L USM
ENG
Instruction
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Thank you for purchasing a Canon product. The Canon EF17-40mm f/4L USM is a high- Features performance wide-angle zoom lens. 1. Two aspherical elements and a Super UD • “USM” stands for Ultrasonic Motor. element result in outstanding image delineation. 2. Ultrasonic motor (USM) for quick and quiet autofocusing. 3. Manual focusing is available after the subject comes into focus in autofocus mode (ONE SHOT AF). 4. A truly round aperture hole results in a nicer background blur. 5. Tight seal struct
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a Safety Precautions This device complies with Part 15 of the FCC Rules. Operation is a Safety Precautions subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any • Do not look at the sun or a bright light source interference received, including interference that may cause through the lens or camera. Doing so could result undesired operation. in loss of vision. Looking at the sun directly through Do not make any changes or
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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 (→ **). ENG-3 C OP Y
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1. Mounting and Detaching the Lens See your camera’s instructions for details on The lens mount has a rubber ring for enhanced mounting and detaching the lens. 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. • After detaching the lens, place the lens with the rear end up to prevent the lens surface and electrical contac
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2. Setting the Focus 3. Zooming Mode To shoot in autofocus (AF) mode, set the focus To zoom, turn the lens’ zoom ring. mode switch to AF. To use only manual focusing (MF), set the focus Be sure to finish zooming before focusing. Changing the zoom ring after focusing can affect mode switch to MF, and focus by turning the the focus. focusing ring. The focusing ring always works, regardless of the focus mode. After autofocusing in ONE SHOT AF mode, focus manually by pressing the shutter button half
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4. Infinity Compensation Mark 5. Infrared Index Infinity compensation mark Distance index To compensate for shifting of the infinity focus The infrared index corrects the focus setting when using point that results from changes in temperature. monochrome infrared film. Focus on the subject The infinity position at normal temperature is the manually, then adjust the distance setting by moving the point at which the vertical line of the L mark is focusing ring to the corresponding infrared index m
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6. Hood 7. Filters (Sold separately) You can attach filters to the filter mounting thread on the front of the lens. •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). The EW-83E hood can keep unwanted light out of the lens, and also protects the front of the lens from rain, snow, and dust. To attach the hood, align the hood’s attachment posit
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8. Filter Holder 9. Extension Tubes (Sold separately) You can attach Extension Tube EF12 II or EF25 II for magnified shots. The shooting distance and magnification are shown below. Camera-to-Subject Magnification Distance (mm) Near Far Near Far 17mm 155 159 0.83× 0.70× EF12 II 40mm 206 271 0.59× 0.32× There is a gelatin filter holder at the rear of the 17mm Incompatible lens. Cut the gelatin filter to fit within the white EF25 II 40mm 196 218 1.02× 0.70× frames. Then insert the gelatin filter
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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. • Manual focusing is recommended for accurate focusing. ENG-9 C OP Y
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11.Specifications Focal Length/Aperture 17 – 40 mm f/4 Lens Construction 9 groups, 12 elements Minimum Aperture f/22 Angle of View Diagonal: 104° – 57° 30’ Vertical: 70° 30’ – 34° Horizontal: 93° – 49° 20’ Min. Focusing Distance 0.28 m/0.92 ft. Max. Magnification 0.24× (at 40 mm) Field of View 234 × 365 mm – 100 × 150 mm / 9.2 × 14.4 inch – 3.9 × 5.9 inch (at 0.28 m) Filter Diameter 77 mm Max. Diameter and Length 83.5 × 96.8 mm / 3.3 × 3.8 inch Weight 475 g / 16.8 oz Hood EW-83E Lens Cap E-77U C
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CT1-7546-006 © CANON INC. 2003 2009.7 C OP Y
