There’s a sea of iPhone accessories available, but how many of end up in the hands of people who love photography, video and pro audio? The right iPhone accessory could prove to be the ultimate holiday gift. In this guide we’ll help you navigate the iPhone waters and introduce you to gadgets that dramatically improve the optics of your iPhone’s camera, audio upgrades that give you recording-studio-quality sound, and battery extenders that have enough juice to make it through the entire shoot.