Bonotary
The Bonotar is a three-lens lens for photo cameras. It was calculated in 1953 by Claus Lieberwirth for Feinmess Dresden and was produced until 1960. Its basic construction follows the Cooke triplet . The Bonar lens was derived from him .
history
Feinmess Dresden emerged in 1946 from the remains of the dismantling and expropriation of the precision mechanical plant Gustav Heyde KG. The company's classic business area was optical products such as geodetic instruments, telescopes, periscopes or handheld rangefinders for aerotopography. However, the company never produced lenses for cameras.
At the beginning of the 1950s, the Welta camera factory in Freital asked for a lens for the Belfoca 1 and 2 medium format cameras to be supplied . The previous suppliers Ernst Ludwig and Meyer-Optik were not in a position to cover the need for triplets on their own. Feinmess accepted the order and had Richard Hummel von der Ihagee set up an optical computing office, which Claus Lieberwirth took over in August 1953 to invoice the lens.
From 1954 the Bonotar was produced as a coated lens with a focal length of 105 mm and a maximum aperture of 4.5. In the GDR it competed with the Trioplan from Meyer-Optik (f / 2.8, 100mm), but turned out to be less light , structurally simpler and cheaper. With the non-remunerated Bonar (f / 6.5, 105mm) derived from the Bonotar, the movement offered an even weaker and cheaper alternative to the Bonotar. A feature of the lens was the curvature of the second surface, which led to a good image field flattening, but the necessary greater curvature of the first surface was also one of the reasons for the relative weakness of light of the Bonotar.
Around 20,000 copies of the Bonotar were installed in the delivered central locks in front lens settings. Around 14,000 units with an M42 connection and 4,000 units with an Exakta bayonet were later designed as interchangeable lenses . The interchangeable lenses were not sold as standard lenses via camera factories, but sold by independent specialist dealers. It established itself in the GDR as a popular alternative to the high-priced Meyer-Optik Trioplan.
In 1960 the production of the Bonotar and Bonar was stopped and the optics department with 130 employees was merged with the production of Zeiss Ikon to form a production department of Carl Zeiss . The decisive factor was the intention to concentrate the optical industry, which later brought together all optical companies in the GDR under the Pentacon umbrella .
The Feinmess Dresden company continued to exist, in 1970 it became part of VEB Carl Zeiss Jena as VEB Feinmess Dresden and concentrated on measurement products. In 1992 the company, now trading as Feinmess Dresden GmbH, became part of the Steinmeyer group of companies, a manufacturer of precision screw drives. Today, under the name Steinmeyer Mechatronik, the company is a manufacturer of high-precision positioning solutions.
proof
- ↑ a b c d e Claus Lieberwirth: Das Bonotar von Feinmess Dresden in: PhotoDeal, No. 42, 3/2003, pp. 21-23
- ↑ mechatronik.steinmeyer.com: Steinmeyer Mechatronik GmbH: History ( Memento of the original from June 29, 2015 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. , Accessed October 27, 2015
