In the past few years, we have covered various iPhone lenses and DSLR lens mounts that let you take your videos to the next level. The Moondog Labs 1.33X Anamorphic Lens is worth a look if you want to capture ultra-wide footage. It lets you record 2.4:1 video and 16:9 stills. It also adds character to your footage with flares.
This lens has an anodized aluminum design. It comes with a 37mm lens mounting thread. It works with the BeastGrip Pro and other iPhone filmmaking rigs.[where to get it]