The Zweiverschluss Duplex is a folding bed camera made by Ihagee from 1927 to '39. It is oriented for horizontal pictures, and equipped with both a focal plane shutter and a leaf shutter. The camera was made in 6.5x9 cm, 9x12 cm and 10x15 cm sizes. McKeown states that there was a stereo/panoramic model of the 10x15 cm camera.
- 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). p438-9.
- 9x12 cm Zweiverschluss-Duplex with 15 cm f/3.5 Ihagee Anastigmat Trioplan (made by Meyer for Ihagee), dial-set Compur shutter with speeds to 1/200 second, and focal-plane shutter to 1/1000 second, offered for sale at Camera Auction 26, on 22 November 2014, by Westlicht Photographica Auction. The FP shutter is of the type where the spring tension and slit-width are adjusted separately.