Gondor DSLR Rig Cage Camera Follow Focus Handle w/ HDMI Clamp for 5D/7D/GH3 The bottom of the DSLR cage is ported for battery access on the Canon 5D/7D/1DmkIV. Although the cage will work with other DSLR cameras, this particular model is geared toward the Canon 5D/7D. The entire DSLR cage is CNC milled from billet aluminium and is black anodized for durability. Each standard 1/4 20 threaded mounting hole is lined with stainless steel helicoils which prevents threads from stripping out which can happen quite easily on purely aluminium threads.