I shoot tethered when I can: camera hooked up to my laptop when shooting with light. I love to see my shot on a bigger screen and so do my clients – I just love the instant feedback, but this takes power. Power on my Mac lasts about 4 to 5 hours when shooting with Capture One, so it just isn’t enough for a full days shoot, for this the Hyper Juice kicks in! It’s basically a power pack for a Mac and keeps it going for about an extra 10 hours. Not only does it power your Mac but anything else that you can plug in as it has two USB ports. On my recent trip to the US and Canada I loved it for charging 2 iPhones as I walked, stuffed in my camera bag – I love having POWER!!!