you dont, you connect your dslr to your computer/laptop (a long usb cable is really usefull here), you then, can control it with your iphone through the wifi. ive had my laptop in my dining room where i cant see the garden, camera on a tripod in the garden focused on a birdfeeder only about a meter away (way closer than i could stand to it without scaring off the birds) and had the two connected with a large usb. i could then go to my bedroom where i could see the garden from my window, see when a bird was at the feeder, use the live view through the iphone so i could wait for the perfect composure, and then take the picture in any number of ways with the phone, change any settings that need changing including aperture, shutter, iso, wb, exposure compensation, etc, and also shoot single frame, continuos, or even time lapse.