Self-centering lens arrangement for a transmitting, refractive optical unit

A lens arrangement for an optical unit operating transmissively and refractively in a predetermined spectral range, comprising:

• at least two lenses, wherein each of the at least two lenses transmits in the predetermined spectral range,
• a common casing, in which the at least two lenses are arranged in sequence, wherein the lenses are at least substantially aligned radially, axially and angularly inclined with respect to a common optical axis,
• wherein adjacent lenses of the at least two lenses form respective abutment faces that face one another, and wherein the adjacent lenses rest against one another by way of the respective abutment faces, and
• an elastic tensioner configured to provide axial pressure to the sequence of lenses,
• wherein a first of the lenses is axially aligned by the common casing;
• wherein a first subset of the lenses in the sequence are radially aligned by the common casing,
• wherein a gap is formed between each lens of a second subset of the lenses and the common casing such that each lens of the second subset of the lenses is not radially aligned by the common casing, and
• wherein the second subset of the lenses in the sequence are aligned by the respective abutment faces of the respectively adjacent lenses, such that all lenses of the sequence are aligned radially, axially and angularly inclined with respect to the common optical axis.