The Koerma is a strut-folding plate camera, first made in about 1902-3 by Körner und Mayer, the company which became Nettel Kamerawerk; The camera has the characteristic strut system of Nettel, using adjustable strut extension for focus control, with the end of one strut indicating the focus distance on a scale in a slot in the camera body. It has a folding wire-frame finder. It is very similar to the Cewes except that the Cewes is for both plates and roll film. McKeown lists the camera only in 9x12 cm size, whereas the Cewes was made in several other sizes.
An example of the Koerma was sold at Westlicht (listed incorrectly as a Cewes). This example has a 140 mm f/7.5 Nettel Aplanat lens and a 'Victus' shutter with speeds 1/25 - 1/100 second, plus 'B' and 'T'.
- McKeown, James M. and Joan C. McKeown's Price Guide to Antique and Classic Cameras, 12th Edition, 2005-2006. USA, Centennial Photo Service, 2004. ISBN 0-931838-40-1 (hardcover). ISBN 0-931838-41-X (softcover). p713.
- As McKeown points out, the camera name is plainly derived from the original company name; however Koerma, or Kurma, is also the name of the incarnation of Vishnu as a turtle.
- Koerma listed as a Cewes, sold at the fourth Westlicht Photographica Auction, in November 2003.