When you're shooting for an exaggerated point of view, twist on the Pro DV Series Fisheye Adapter. The Fisheye gets you a wider view with pronounced barrel distortion and no vignetting. This non-zoom-thru add-on provides fisheye focal length, an extra wide degree horizontal angle of view and weighs only 7.6oz.
The fisheye exaggerates depth, pulling nearby objects closer, and causing distant objects to recede into the background. A fixed adapter, the Fisheye doesn't allow for zooming - but you'll want to stay at the wide end of the range anyway, for the most pronounced effect.
Comes in the popular Bayonet Mount that attaches with a twist to the front of your Sony lens.