The patented 15°-stop system is optionally available for the FT series. Simply remove dummy cover and mount knob. This additional knob allows for locking the panoramic base every 15° so that the photographer can take the panoramic picture without reading the scale. In addition, a quick locking mechanism has been provided at the 0° position to allow for quick and secure removing and attaching of the tripod head from or to the tripod. This knob is already integrated in the FTR series.