This lens has 20x zoom and fits onto Android devices. Photo from androidpit.com.

Muku Labs showcased its Android case/lens accessory featuring a 20x lens at Mobile World Congress in Barcelona, Spain this week. Along with the impressive telephoto, the case can fit a wide-angle lens, fish-eye or macro lens. The device was demonstrated on a Galaxy S3, though AndroidPit reports that it will be available for "smartphones of all shapes and sizes."

Muku Labs also makes Shuttr, a remote shutter button that triggers image capture in the native camera app on the iPhone, iPad and iPod touch, as well as the Samsung Galaxy S3 and Note 2. Other Android devices can use Shuttr with its designated app.

Check out this (silent) video of the Muku Labs case and lenses from AndroidPit: