Lens device

A lens device for inspecting an object having at least one end surface and at least one lateral surface, substantially orthogonal to the at least one end surface, the lens device comprising a lens device body which develops along an optical axis (X) and, carried by the lens device body, a front optical group, a rear optical group acting as prime lens for collecting beams originating from the front optical group, a stop inserted in the rear optical group, and a sensor plane collecting beams projected by the rear optical group, wherein the front optical group comprises only refractive lenses and is formed by at least one front lens configured to receive beams both from the at least one end surface of the object, perpendicular to the optical axis (X), and from the at least one lateral surface of the object, substantially parallel to the optical axis (X), and by one or more converging lenses arranged behind the at least one front lens and suitable to focus the beams received from the at least one front lens towards the rear optical group, the front optical group being configured so that an entrance pupil is external to the lens device.