Device and method allowing observation of an object with a large field of observation without use of magnifying optics between a light source and the object

A method for observing an object comprising:

• placing the object between a light source and an image sensor, the light source being coupled to an optical system that is entirely placed between the light source and the object;
• activating the light source, the light source then emitting an emission light wave that propagates to the optical system, the optical system forming a convergent incident light wave that propagates to the object;
• and
• acquiring, using the image sensor, an image of the object thus exposed to the convergent incident light wave;
• wherein:
• the emission light wave is emitted along a propagation axis, the object defining an object plane, that passes through the object and that is perpendicular to the propagation axis, such that, during the activating the light source, the optical system conjugates the light source with a secondary point, the secondary point being located in a half space that is defined by the object plane and that includes the image sensor, the secondary point being positioned at a convergence of the convergent incident light wave;
• and
• the secondary point is located closer to the image sensor than to the object so that the image of the object on the image sensor is affected by a magnification lower than 1.