Really cool tool. I haven't seen anything like it. Seems you can also get the panning effect with with a hacked egg timer but the cable is slider is nice.
to do a firmware update you use a USB flash drive for firmware updates. Here's one from tonight. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--FR5rMdftA8.html
Derek Chapman Actually no , its really great with the 5d mark 3 , there is no issues at all, i just didn't attached the wire in the right way . but other than that its really perfect ! buy it !