If the Holga filter dial is at the cheap, tacky, plastic end of the iPhone lens case market, then the iPhone Lens Dial is at the very top end. It also costs ten times the price.
The chunky case is a carved from aircraft-grade aluminum, has two tripod mounts (for portrait and landscape shots) and features an unmissable disk with three lenses. Like the lens turret on old Super-8 movies cameras, this allows you to twist each lens into position.
On that dial you’ll find a 0.7x wide-angle, a 0.33x fisheye and a 1.5x telephoto lens. It’s a lot like the triple-lens pack but without all the sticky magnets and easy-to-lose lenses.
Despite all this metal and glass, the case weighs in at just 10 ounces (280 grams). Not light, but still lighter than your camera.
The price for this magnificently extravagant accessory is $250. That’s probably more than you paid for your iPhone.