Mounting a camera directly to to the levelling base saves the additional bulk, weight and cost of an additional head. The 'oil-head' movement is sufficiently dampened to allow steady and precise alignment of levels and, once the framing is set vertically, horizontal alignment to the subject plane is fine tuned by 'fluid' panning. This one is the SUNWAYFOTO LEVELLING HEAD DYH-90RI has a 90mm diameter top plate. Like all bulls eye spirit levels, bar the ones from. Miller Professional, I would not trust it,

iPhone, room light. LOL