Just a few weeks ago while I was down in the Caribbean, I had the fun of testing out an iPhone 5 camera polarizing filter from Photojojo. While the clip-on filter worked -- sort of -- it had a problem with causing some vignetting of photos. Now Trygger is shipping The Camera Clip (US$39.95), which is double the price of the Photojojo unit but also does its job without the vignetting limitation.
The Camera Clip was funded on Kickstarter and is a small plastic, metal and glass device that slides onto the upper right side of a "naked" iPhone 5. It blocks the flash, but generally you won't be using a polarizing filter and flash at the same time. As mentioned in the review of t