At first glance, the Olloclip only appears to include two lenses, but unscrewing the wide-angle reveals the cleverly hidden macro. To use any of the built-in lenses, simply slide the clip onto your iPhone.
The fit is quite snug, so you can rotate the phone, walk around, and even slip your phone into a bag without worrying about the lens slipping off.
It's also easy to reposition -- to swap the wide-angle for the fisheye, for example, just flip the entire clip around so that the lens you want to use is facing forward.
As with all sub-$100 optics, it doesn't have the sturdy, metal construction of, say, a $2,000 professional-class Canon L-series lens, but for a pocketable accessory with a potentially limited shelf life, we're more concerned with the device's performance than we are with how it feels in our hands. The plastic lens mount is also less likely to damage the glass body of your iPhone 4, so we don't mind that the clip itself isn't made of metal.
Though it's small enough to fit inside your front pants pocket, the lens still protrudes from the iPhone in a big way. The rather obnoxious product branding also makes it conspicuous, but that, at least, is removable (we chose to detach it for our product photos, and new Olloclips ship without the logo sticker).
Even without the branding, it's an eye-catching device, prompting several locals to approach us with questions during our testing in New York City. One woman even asked us to demo the lens for her. As it happens, she tried out the fisheye lens, and was very impressed with the results.
The Olloclip ships with lens caps for both primary lenses, and a small carrying pouch that also doubles as a microfiber cleaning cloth.
Because of its size, we found ourselves constantly touching and smudging up the lens accidentally, so that microfiber cloth will certainly come in handy.
The device is available with either black or red barrels -- both constructed from anodized aircraft-grade aluminum.
A ridged simulated filter mount surrounds the fisheye lens's front element, complimenting the lens aesthetically, though clearly not serving any functional purpose, as you won't be adding any filters to the Olloclip.
The multi-element lenses are constructed of precision-ground glass, and that's clearly reflected in the image quality we were able to achieve here.

Product Specifications
Quick-connect camera lens for iPhone 4 and 4S
Three lens options: fisheye, wide-angle, macro Slides on to the corner of your iPhone and automatically aligns itself
The camera will autofocus as normal with the Olloclip on, don't worry! Works for still photos, videos, even Facetime Lenses made with precision ground glass multi-element optics Barrels made from aircraft grade anodized aluminum Soft plastic material on clip protects your iPhone from scratches Included in the Olloclip package:
Fisheye lens
Wide-angle lens
Macro lens
Lens caps for both ends
Microfiber lens cleaning cloth storage bag
Note: The Olloclip is specifically designed for the shape and size of the iPhone 4 or 4S. It will not fit any other device.
Dimensions:1.37" tall x 1.22" across at the widest section Weight: 0.7 ounces