Your iPhone is already capable of capturing amazing photos and videos. With additional lenses, you can do even more with your smartphone camera. These 3 lens mounts let you attach DSLR lenses to your iPhone:
EnCinema SLR Lens Adapter: lets you attach SLR lenses to your smartphone to capture challenging shots. It has a 49mm back end mount. Since it is built with the Canon EOS mount, you can try all kinds of lens with it.
Turnikit for iPhone 7: it works with Canon lenses but Nikon lenses are supported with the Nikon mount adapter. It is metal and has a tripod mount.
Have you found better smartphone DSLR lens mounts? Please share them here.