So you got a Beastgrip Pro or Beastcage cage and would like get more out of your smartphone? The Beastgrip Pro-Series 1.33X Anamorphic Lens is worth a look. It lets you achieve 2.4:1 aspect ratio in your video for that cinematic look. It enhances your videos with horizontal lens flares and a wider field of view.
The lens has a machined aluminum body with 37mm threaded lens mount and 58mm front filter mount. It works with iPhone and Android smartphones.[where to get it]