The 1.5x Canon TL-U58 Tele-Converter Lens is designed to extend the telephoto range of Canon's XA50, XA55, XF405, and XF400 camcorders. Use this tele-conversion lens to capture far-off subjects while maintaining UHD 4K clarity and precision. The front-mounting TL-U58 lens fits the camcorder's 58mm filter thread.