You want 3D, huh? Well, do you want it bad enough to endure perpetual Johnny Five jokes? Because this 3D Lens-In-A-Cap not only looks like the beloved robot from the 1980s movie, it also seems to be using technology from the same era. The aperture can be opened up to a maximum value of F11, meaning your light intake will be, erm frugal, while the minimum focusing range is a distant 1.5 meters away from the sensor. Still, it'll get you two perfectly paired snaps and the Canon EOS mount version can be had now for $166. What are you waiting for -- the future's just a few clicks away.
