Canon zoom lens ef 17-40mm 1:4

The Canon EF 17-40mm f/4L USM is a high-performance ultra-wide-angle zoom lens, designed for both full-frame and APS-C sensor cameras. As part of Canon’s prestigious L-series lineup, this lens delivers exceptional optical quality, versatility, and durability. Its constant f/4 aperture and wide-angle focal range make it ideal for landscapes, architecture, interiors, and creative photography.

Whether you’re a professional photographer or a hobbyist looking to enhance your kit, the Canon 17-40mm f/4L provides sharp, high-contrast images with minimal distortion. It's lightweight, weather-sealed, and built for demanding conditions, making it an excellent choice for photographers who need consistent performance in any environment.

Key Features

1. Ultra-Wide Focal Range

The 17-40mm focal length delivers versatility, making it perfect for capturing stunning landscapes, group shots, and architecture. On full-frame DSLRs, it provides a true ultra-wide perspective, while on APS-C cameras, it translates to a 27-64mm equivalent focal length—ideal for a wide variety of shooting scenarios.

• Full-Frame: 17-40mm ultra-wide field of view
• APS-C Sensor: Equivalent to 27-64mm focal length

This flexibility allows photographers to experiment with composition, dramatic angles, and expansive perspectives.

2. Constant f/4 Aperture

The lens features a constant f/4 maximum aperture throughout the zoom range. This ensures consistent exposure, whether you’re zoomed in at 40mm or shooting wide at 17mm. While ideal for daytime and outdoor shooting, the f/4 aperture also performs well in low-light conditions with longer exposures or a tripod.

3. Exceptional Optical Quality

The Canon EF 17-40mm f/4L is designed with superior optics that minimize distortion and chromatic aberrations. The lens features:

• 3 Aspherical Elements: For edge-to-edge sharpness and minimal distortion.
• Super UD (Ultra-Low Dispersion) Glass: Reduces chromatic aberration for accurate color reproduction and clarity.

Combined, these elements produce stunning images with exceptional sharpness, contrast, and minimal flare or ghosting.

4. Ultra-Sonic Motor (USM) for Fast and Silent Autofocus

Equipped with Canon’s Ring-Type Ultra-Sonic Motor (USM), the lens delivers lightning-fast and precise autofocus. It’s virtually silent, ensuring minimal disruption when shooting wildlife, events, or video. Additionally, it offers full-time manual focus override, allowing you to fine-tune focus even when the lens is set to autofocus mode.

5. Robust, Weather-Sealed Build Quality

Built to Canon’s L-series standards, the EF 17-40mm f/4L is both durable and reliable:

• Weather-Sealed: Dust and moisture-resistant construction ensure the lens can withstand harsh outdoor conditions.
• Metal Lens Mount: Provides stability and longevity for professional use.
• Lightweight Design: At only 475g (1.05 lbs), it’s easy to carry for extended shoots.

This rugged build makes it a perfect companion for outdoor photographers and adventurers.

6. Smooth Bokeh with 7-Blade Aperture

The 7-blade circular aperture ensures pleasing bokeh (background blur) for creative depth-of-field effects, even with an f/4 aperture. This makes it a great option for portraiture or isolating subjects in wide-angle shots.

7. Compatibility with Canon Filters

The EF 17-40mm f/4L accepts 77mm filters, allowing for creative control over exposure and effects. It’s compatible with popular filters like polarizers, ND filters, and graduated filters, making it ideal for landscape photographers who need precise control over light.

Perfect for Landscapes, Architecture, and Travel

With its ultra-wide angle and optical precision, the Canon EF 17-40mm f/4L is tailored for:

• Landscape Photography: Capture expansive scenes with incredible detail and clarity.
• Architecture and Interiors: Achieve minimal distortion for clean lines and sharp edges.
• Travel Photography: Lightweight and versatile, ideal for capturing vast landscapes and urban exploration.

For photographers seeking a balance between performance, portability, and affordability, this lens is an excellent investment.

Specifications

• Focal Length: 17-40mm
• Maximum Aperture: f/4
• Lens Mount: Canon EF
• Angle of View: 104° - 57° (Full-frame)
• Minimum Focus Distance: 0.28m (11 inches)
• Autofocus: Ring-type USM
• Optical Construction: 12 elements in 9 groups (including 3 Aspherical and 1 Super UD element)
• Aperture Blades: 7 (circular)
• Filter Size: 77mm
• Dimensions: 83.5mm (diameter) x 96.8mm (length)
• Weight: 475g

Why Choose the Canon EF 17-40mm f/4L USM?

1. Outstanding Image Quality: Edge-to-edge sharpness, vibrant colors, and minimal distortion.
2. Rugged and Weather-Sealed: Perfect for outdoor, travel, and professional use.
3. Versatile Focal Range: Ultra-wide 17mm for dramatic shots and 40mm for standard framing.
4. Fast and Quiet Autofocus: Ideal for still photography and video recording.
5. Lightweight and Compact: Easy to carry without compromising performance.

Description

Only selling as I've upgraded and no longer use, is a great lens!

LensCanon Zoom 17-40mm F/4 L-series USM lens in great condition. ultrasonic includes genuine CANON lens hood Glass all clean and clear Photo of the actual lens

Focal Length: 17 - 40mm Maximum Aperture: 1:4 Inner focusing system with USM Closest Focusing Distance: 0.28m / 0.9 ft. Max. Diameter x Length, Weight: 3.3" x 3.8", 1.1 lb. / 83.5 x 96.8mm, 500g Auto focus or manual focus.