There are cases that allow you to use additional lenses for your iPhone, but the Phocus case goes one step beyond those. It will let you use your DSLR lenses, either Canon or Nikon, to get the best picture possible. However, your iPhone might no longer be as compact as you would have liked.
The Phocus iPhone case does a good job of using your existing lenses, especially if you’ve already got a DSLR. The case might be best suited for photographers trying to get the most out of their iPhone, and who want to mount their smartphone on a tripod. Watch out if you’ve got big telephoto lenses though, it could get quite bulky.
The Phocus case comes in two packages, one that sells for $99.95(USD) that comes with two extra lenses and one that sells for $134.95 that comes with three. You’ll have to spend extra to get the Canon or Nikon lens adapters, which sell for $220 and $245 respectively, so it can add up really quickly.
If you’re going to spend this much money and carry around giant lenses anyhow, it makes me wonder why you don’t just use your DSLR itself.