Your iPhone’s touchscreen interface is versatile as hell, but it’ll never be as swift or intuitive as what can be attained with physical buttons, knobs, and sliders. That said, for serious photography, try adding a Snappgrip to your naked phone. This crafty kit includes a standalone case plus a grip that snap together to offer physical shooting controls via Bluetooth, like a two-step shutter (half depression to focus, full press to shoot), a shooting mode wheel, flash toggle, zoom controls, plus a 1/4-inch tripod mount on the underside. Naturally, it also greatly improves ergonomics, lowers the risk of dropping your phone when snapping risky shots thanks to a wrist strap, and adds compatibility with a range of their lenses.
Pick one up at BiteMyApple – $70