Your iPhone already comes with everything you need to capture amazing photos and video. The ULANZI DOF Adapter with Sony E Mount lets you take your game to the next level. It allows you to use DSLR lenses with your smartphone camera. You can use this with a ULANZI U-Rig or other comparable cages and lens cases.
In order to get the most out of this DOF adapter, you will want to bring a faster lens. It does flip the image upside down, so you will have to use an app to flip it back to normal while shooting. Sets you back under $140 at this time.
[where to get it]