The Sigma TC-1401 1.4x Teleconverter for Canon EF-mount lenses extends your lens’s focal length by 1.4x while maintaining full communication between the lens and camera for autofocus performance up to f/8. Featuring a Special Low Dispersion element, it minimizes chromatic aberrations for excellent image quality. Its durable, dust- and splash-resistant design ensures reliable use in challenging conditions. Note: Autofocus may not function with lenses having a maximum aperture of f/5.6 or slower. Manufacturer items include the teleconverter, soft carrying case, and front and rear caps. Bundle includes a lens pouch, full cleaning kit, and lens cap keeper. *International Version with 1-year seller warranty. Warranty is managed directly by the seller instead of the manufacturer. To use the warranty, please email customer service.*