Methods, systems and apparatuses proving a high dynamic range imager. The tensioner includes a tension lever, an intermediate member, and a brake lever all pivotally mounted on a rigid base. For example, one or more alignment features on the platform are engaged with one or more alignment features on the modules to allow the platform to substantially float within an X-Y region defined by the alignment features. Parts of the curved portions most recessed toward the center in the plate width direction are arranged to face the contact start position of the contact in the plate width direction.