The Cyclopital3D Stereo Base Extender is designed for the HDR-TD10 & HXRNX3D1U Sony 3D camcorders. It works by increasing the Stereo Base or lens spacing from 1.18" (30mm) to 5.51" (140mm). This lets you record subjects in 3D that are four times further the normal limit for recording in 3D. The extender quickly attaches to the tripod mount of the camcorder. It features sealed mirror chambers and anti-reflective glass covers on the front of the device.