For this camera, you need a 4 pin to 9 pin firewire cable. For example, this one... http://www.monoprice.com/products/product.asp?c_id=103&cp_id=10301&cs_id=1030104 &p_id=3541&seq=1&format=2
You will need to check if your Retina MBP has Firewire. Some recent Macs only have Thunderbolt. In this case you will also need a Thunderbolt to Firewire Adaptor.
Then it should import into iMovie.