1. GENERAL INFORMATION

• Product: Canon EF 17-40mm f/4L USM Lens
• Lens Type: Wide-Angle Zoom Lens
• Lens Mount: Canon EF Mount
• Focal Length: 17-40mm
• Maximum Aperture: Constant f/4
• Lens Series: Canon L-Series
• Compatible with Canon EOS DSLR cameras featuring an EF mount
• Compatible with Canon EOS R-series cameras using an EF-EOS R Mount Adapter

2. OPTICAL PERFORMANCE

• Wide-angle zoom range for capturing broad scenes
• Constant f/4 maximum aperture throughout the zoom range
• High-quality optics for clear and detailed images
• Super Spectra Coating helps reduce flare and ghosting
• Suitable for wide-angle photography in different environments

3. AUTOFOCUS SYSTEM

• Ultrasonic Motor (USM) autofocus
• Fast and quiet focusing performance
• Full-time manual focus adjustment
• Accurate focusing for photography

4. LENS SPECIFICATIONS

• Lens Elements: 12
• Lens Groups: 9
• Diaphragm Blades: 7
• Minimum Focusing Distance: Approximately 28cm
• Maximum Magnification: Approximately 0.24x
• Filter Diameter: 77mm
• Maximum Aperture: f/4
• Minimum Aperture: f/22

5. DESIGN & CONSTRUCTION

• Professional Canon L-series lens design
• Durable construction for regular use
• Compact wide-angle zoom design
• Designed for photography enthusiasts and professionals
• Dust- and moisture-resistant features under appropriate conditions

6. PHOTOGRAPHY APPLICATIONS

• Landscape photography
• Architecture photography
• Interior and real estate photography
• Travel photography
• Street photography
• Group photography
• Event photography

7. PACKAGE CONTENTS

• Canon EF 17-40mm f/4L USM Lens
• Front and rear lens caps
• Lens hood and carrying pouch, depending on the package

8. COMPATIBILITY NOTE

• Designed for Canon EF-mount DSLR cameras.
• Can be used with compatible Canon EOS R-series mirrorless cameras through an EF-EOS R Mount Adapter.
• Included accessories may vary depending on the package.