[davidmanze]

The force (torque) pulls the element down, you hold the camera, don't you? That is the "rotation point". The further the weight is from where you hold the camera, the higher the torque. The weight remains the same, of course.

     

 I understand what you are saying BC but no! ...... you are talking about a "bending moment" .... which means a deviation from a straight line ...... leaf spring suspension is a form of bending moment   .....  

 .....    "torsion bar suspension" is a elastic/ spring force brought about by twisting/rotation of one end only of a round spring steel suspension bar for example ..... 

 you must differentiate between "a twisting force" and a "bending force"

 ......... a "crow bar" exerts a bending force (linear straight line force).......

 ........ a spanner imparts torsional force on a nut (rotational force ...... about the bar's own axis ) .....
  
  No matter how or where you hold the camera/ lens, you are only supporting the weight of the combination (linear force oriented by gravity) ...... you are never applying a twisting moment about the lens's own axis ....