Olloclip 4-in-1 Lens
Amazon | $80
Add-on lenses for smartphones started out as something of a novelty, but the idea has been refined to a considerable degree in recent years. Some of the standout lenses are from Olloclip, including this 4-in-1 set for all iterations of the iPhone 6. It gets high marks from Macworld, and includes two macro lenses, a wide-angle, and a fisheye lens that'll keep you covered for shooting close-ups and landscapes alike.
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Moment lenses
Along with Olloclip, Moment makes some of the most popular and highly regarded add-on lenses around (for various iPhones and some Samsung Galaxy models). They're the top pick of The Wirecutter, and also come well-reviewed by Macworld, Tom's Guide and others. A slight downside is that you need to use a non-permanent adhesive to attach the lens' mounting plate to your phone but, unlike many such lenses, they'll still work with many cases. Moment also makes its own iPhone cases that add a more camera-like grip and shutter button.
