Privacy is defined in the context of a guessing game based on the so-called guessing inequality. A control signal, based on the actual image area, is generated and sent to the electronic camera for controlling the electronic shutter. The piston cylinder end cap also connects the housing and the piston. The method can also include assaying for the aptamer ligation product in order to detect the small molecule presence in the sample. Relative to the surface in which the recess is provided, the recess has a maximum depth which ranges between about 0.