Ernst Leitz G.m.b.h.

Ernst Leitz Gmbh, Optische Werke

Norbert Meinert

Heinz Broemer

Johann Spincic

A fluorophosphate glass of a high positive anomalous partial dispersion .DELTA..nu..sub.e within the range of from about +10.0 to about +21.0, a relatively high index of refraction n.sub.e within the range of from about 1.47 to about 1.54, and an Abbe number .nu..sub.e within the range of from about 84.1 to about 51.0 is provided. A simple process of melting such a glass is disclosed.

Optical fluorophosphate glass and process of making same

Optical silicate glasses containing titanium dioxide and having a high index of refraction and high dispersion are composed of

Titanium dioxide containing glasses having a high index of refraction

A fluorophosphate glass which has an index of refraction n.sub.e of more than 1.57, an Abbe number .nu..sub.e of less than 70, and a relatively high positive anomalous partial dispersion +.DELTA..nu..sub.e is provided.

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Bielhausen, Germany

Norbert Meinert