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The Canon EF 16-35mm f/4L IS USM Lens is a wide-angle zoom lens featuring a constant f/4 maximum aperture to provide consistent performance throughout the zoom range. The optical design incorporates three aspherical elements, including one large-diameter aspherical element, as well as two UD (Ultra-low Dispersion) elements to minimise chromatic aberrations and contribute to high edge-to-edge sharpness and resolution. A fluorine coating has also been applied to the front and rear lens surfaces to reduce flare and ghosting for maintained colour neutrality and image contrast.
Benefiting working in difficult lighting conditions, an Optical Image Stabiliser has been integrated into the lens design to minimise the appearance of camera shake by up to an effective four shutter speed steps. For fast, smooth, and near-silent autofocus performance, a ring-type USM (Ultrasonic Motor) AF motor is employed and benefits from an internal focusing design to maintain the overall length of the lens during use. Full-time manual focus override can also be utilised for fine-tuned focusing precision as closely as 11inch throughout the zoom range.
When paired with an optional Protect filter, this lens also exhibits a dust- and water-resistant construction to enable its use in inclement conditions.