I read this paragraph online, what's the hardware for this?
The normal method of getting a subject in focus during macro work is to adjust the lens to the approximate focus point and then move the camera / lens backwards and forwards to achieve optimum focus. This is a real pain if the camera is on a tripod! The answer is a macro-focusing stage: this holds the camera and itself is mounted onto the tripod. Knobs then allow you to move the camera/lens smoothly forwards and backwards and also from side to side.