The extra knob on the head, just below the arca Swiss clamp looks like it is for panoramas. No need for a levelling plate/ball, just get the camera level using the ball head , lock it tight. Then pan the camera around by loosening that extra knob. Or perhaps it’s designed for another purpose?
Thank you... and just in case I miss you not using it ever again, feel free to point that out somehow or in some way. Note: I am indeed in the market for a new tripod, but have been considering a geared head over a ball head. Sure... weight... but.
