The Canon EF 17-40mm f/4L USM Lens is a versatile wide-angle zoom lens known for its L-series optics and durable construction. Here are its key features and specifications:
Wide-Angle Zoom Lens:
Designed for full-frame Canon EF-mount DSLRs.
Compatible with APS-C models, providing a 27.2-64mm equivalent focal length range.
Constant f/4 Maximum Aperture:
Maintains consistent illumination throughout the zoom range.
Offers a balance between performance and portability.
High-Quality Optics:
One Super Ultra-Low Dispersion (UD) glass element reduces color fringing and chromatic aberrations.
Three aspherical elements minimize spherical aberrations and distortions for improved sharpness.
Super Spectra coating reduces flare and ghosting for enhanced contrast and color neutrality.
Ring-Type Ultrasonic Motor (USM):
Fast, precise, and quiet autofocus performance.
Internal focusing system for overall lens balance.
Full-time manual focus override for manual adjustments.
Weather-Sealed Construction:
Sealed against dust and moisture, making it suitable for challenging environmental conditions.
Ideal for outdoor and travel photography.
Rear Filter Holder:
In addition to the front 77mm filter ring, the lens has a rear filter holder for up to three cut gel filters.
Provides creative options for controlling light and achieving desired effects.
Rounded Seven-Blade Diaphragm:
Creates a rounded aperture with seven blades for smooth and pleasing bokeh.
Beneficial for achieving a pleasing out-of-focus quality.
L-Series Build Quality:
Member of the esteemed L-series, known for premium optical quality and durability.
Sealed construction adds to the lens’s resilience in challenging conditions.
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