Want to use a D|Focus with an HDSLR camera like the Canon 5D Mark II, Canon 7D or Panasonic Lumix GH2 but don't want to add a rail system? If so then the D|Focus D|Mount Bundle is for you. The D|Mount V4 is a new design that utilizes a sliding baseplate the adjust the D|Focus similar to a rail system, but in a smaller, more dedicated package. The V4 is far more robust and reliable than any of the previous versions. The D|Focus will lock down firmly and not come loose under normal use. This Bundle also includes the D Focus Version 3 and the D Gear.