Sigma TC-1401 1.4x Teleconverter Lens for Canon/Nikon/Sony DSLR Cameras - Professional Telephoto Extender for Wildlife, Sports & Portrait Photography

Compact, light, and provides easy extension of focal range, the Sigma TC-1401 1.4x Teleconverter offers an increase in focal length of 1.4 times for select Global Vision lenses. By mounting it in between a telephoto lens and a camera, the offered magnification of focal length of TC-1401 is 1.4 times, offers full communication between the lens and camera, and will allow autofocus to operate at up to f/8. 

The teleconverter incorporates SLD (Special Low Dispersion) glass elements that offer excellent aberration correction. It is exceptional for a lens accessory to use one of the best glass materials, yet this is because SIGMA is seeking the best image quality, and it is necessary to meet the new “SGV” standards. This is suitable for professional use since its durable construction is dust and splash-proof!