[$69.99] Fisheye, Macro 10x, Macro 15x, and Wide-Angle lenses screw on to holder which slides over iPhone
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Pros
Pro Compact
Smaller than a Chicken McNugget, the 4 interchangeable lenses fit comfortably over the iPhone camera. They also fit in a small bag (included), which can fit in pockets or purses.
Pro Affordable, Suprisingly High Quality Macro Lenses
In addition to $70 for 4 lenses being a good deal, the macro lenses take stunning picture of flowers, bugs, still-life, up-close
Cons
Con Poor Image Stability
Since the iPhone is not built with image stability for macro images, it takes a very steady hand to focus on the subject, and is especially difficult for moving subjects.
Con Difficult to Clean
Very easy for dust and dirt to enter the lenses, and hard to clean. After a while, this degrades the quality of the lenses.
Con Wide-angle Lens Distorts
I've found using the panorama feature a better bet for capturing wide-angle because the included wide-angle distorts so much at the edges.