SHOOT 3D with ANY CAMERA

Stereo 3D consists of a PAIR of images, taken from two points of view, simulating the TWO points of view from your TWO eyes to the brain. Subject must not move between exposures! (if subject is moving, stereo camera must be used!)

RULE OF THUMB (for 50mm lens): Lens should move 1/30 distance (along x-axis)  distance from lens to subject.
Best to keep cameras from toeing in (converging) but keystone distortion can be removed digitally.
This method is often called "CHA-CHA", possibly coined by Paul Wing.