Carl Friedrich Holtzem was a pharmacist operating in Elberfeld (now Wuppertal, Germany) from 1891 to 1901. Inter alia he sold cameras and OEM brass lenses under his own name ('C Holtzem Elberfeld') and presumably also dealt in photochemicals.
On record are:
- Aplanastigmat f/8 (actually a Rapid Rectilinear / Aplanat design with four elements in two groups)
- Full strip down and documentation of the Aplanastigmat f/8 (Photographica Collection Dirk HR Spennemann).
- In that year CF Holtzem seems to have acquired the business from the heirs of Julius von Halfern and registered it under is own name: 'Eintragungen im Handesregister' Pharmaceutische Zeitung 21 Oktober 1891, p. 663.—Also on record in a 1894 court case ('Franz Fisseler, Carl Friedrich Holtzem, Wuppertal-Elberfeld ' Landesarchiv Nordrhein-Westfalen Abteilung Rheinland File HRA 7089, Gerichte Rep. 69 Nr. 1894).
- Business sold to Rudolf Illing: 'Eintragungen im Handesregister' Pharmaceutische Zeitung 2 Februar 1901, p. 133
- The OEM for the brass lenses has not yet been identified but may be French.
- Documented example: f/8 to f/64; no serial number; the lens cells are marked with a rubber stamp 'NN-A' (front) and NN-B (rear); dimensions: height 50mm, max Ø46mm, thread Ø41mm, weight 165g full strip down and documentation (Photographica Collection Dirk HR Spennemann).
- Other examples: seen on an Union Reisekamera by Alfred Brückner (Rabenau, Germany) (see Breker March 2011 Lot 349).