Tamron SP AF 10-24mm f / 3.5-4.5 DI II Lens For Canon International Version (No Warranty) Base Kit. Ultra-wide-angle zoom range well suited to landscapes and interiors. Fast f/3.5-4.5 maximum aperture range for available-light shooting. Base kit adds essential accessories to protect and maintain the lens. Base kit offers extra value for shooters wanting an ultra-wide Canon zoom setup.