Alternatively, you can activate the camera simply by pressing the shutter button, which is integrated into the top of the rubber grip. You'll be amazed at how fast Lytro is--there is virtually no lag after pressing the shutter button, and it's ready to take the next photo after a quick preview of the image just recorded.
The top of the camera is also where you'll find the camera's unusual zoom control: a row of touch-sensitive raised bumps. To zoom in, you run a finger across the bumps left to right; to zoom out, you swipe right to left. The Lytro keeps the last zoom level active between uses, which might trip up some users. The touchscreen displays a small visual indicator for the zoom level but it's easy to miss; some users will no doubt turn the camera on and accidentally take zoomed photos. We've photographically enhanced the shutter button and zoom slider to make them easier to see here.