Gabelentz died on 3 September 1874 at his family home at Lemnitz, near Triptis.
The Jenoptik Group headquarters are in Jena, with additional major sites in Germany located in Wedel near Hamburg, Monheim and Ratingen near Düsseldorf, Villingen-Schwenningen, Triptis, the Bavarian town of Altenstadt, and Essen.
From 1901 it became the junction for the railway line through the Höllen valley to Gera and, later, also Saalfeld.