Adapter ring for an optical elements holder device and a related optical elements holder device

An optical elements holder device for a coating station comprising:

• at least one sheet carrier having individual openings, an inner surface of each of said individual openings having at least one shoulder configured to hold an optical element during a coating procedure, said at least one sheet carrier presenting the shape of a dome or a part of a dome which is mounted above a vaporization source so that the optical element is oriented towards said vaporization source;
• and
• at least one adapter ring comprising an outer portion configured to be supported by the at least one shoulder of one of the individual openings of the at least one sheet carrier and wherein the at least one adapter ring also comprises an inner support portion having a face configured to support the optical element having a diameter smaller than the diameter of one of the individual openings, where when the at least one adapter ring is inserted in one of the individual openings of the at least one sheet carrier, the face of the inner support portion of the at least one adapter ring is at the same level as the at least one shoulder of one of the individual openings of the at least one sheet carrier.