I've been experimenting with the GH4 and the Olympus 12mm f2.0 for the past few days...absolutely no issues in balancing it "as is." Panasonic has a neat application for the iPhone that allows you to use the iPhone as a remote viewer/controller via Wifi. So I use a Square Jellyfish mount for the iPhone and have it mounted on the M5 crossbar -- no wires to the camera! The iPhone app is: Panasonic Image App. (A very subtle choice of names, I think.) The Square Jellyfish clampy thingy is: http://www.amazon.com/Square-Jellyfish-Spring-Tripod-Phones/dp/B00C7J5ZC0 (plastic mount) http://www.amazon.com/gp/product/B0..._m=ATVPDKIKX0DER&pf_rd_r=0ZEZ7HPX1HGSNAQQJA0K (metal mount). Go with the metal one if you can afford the extra $2.00. Oh...and it also answers the question facing the Fourth Age of Humankind: What do I do with my iPhone 5 if I upgrade to the iPhone 6? 1. Use it as a Panasonic GH4 viewfinder/controller. 2. Use it with your Phantom 2 Vision+. Andy.