Optimized for Nikon F-mount lenses in the Global Vision line, the TC-1401 1.4x Teleconverter from Sigma will offer an increase in focal length of 1.4 times for select Global Vision lenses. This model offers full communication between the lens and camera and will allows autofocus to operate at up to f/8. The teleconverter also features one Special Low Dispersion element for reducing the appearance of chromatic aberrations and maintaining quality. Additionally, for protection, the TC-1401 is both dust and splashproof. When attached, the 1.4x conversion results in a light loss of approximately one stop. A soft zippered carrying case is included to protect the teleconverter when not in use.Manufacturer Included Items:Sigma TC-1401 1.4x Teleconverter for Nikon FFront CapRear CapSoft Carrying CaseBundle Items Include:1 x Sigma TC-1401 1.4x Teleconverter for Nikon F1 x Pro Sling Backpack1 x SanDisk 64GB Ultra SDXC Memory Card1 x Memory Card Reader1 x Deluxe Cleaning Set1 x 12 Inch Flexible Tripod1 x Memory Card Wallet1 x Wireless Remote Shutter Release1 x Lens Cap Keeper