Apple's iPhone 5s has a new Slo-Mo video capture tool that can create a cool effect on moving objects by shooting at 120 fps (frames per second). Here, we show you how to use Slo-Mo in iPhone 5s, and how you can share the Slo-Mo video you've captured with others. The first step is to open the Camera app on your iPhone 5s. Once it's open, you'll need to slide your finger to the right across the screen (anywhere in the middle will work) until you reach Slo-Mo mode. To begin recording, direct the camera toward your subject and tap the red shutter button. You won't notice any difference yet, just capture the video like you normally would. We find shorter videos are often more effective.