The camera has a 5 cm f/3.5 Tessar (marked for both Krauss and Zeiss, so perhaps made by or for Krauss under licence), and a dial-set Compur shutter with speeds 1 - 1/300 second, plus 'B'.
It has helical unit focusing down to one metre; the knurled focusing ring is accessed at the bottom of the camera, and the distance markings appear in a small notch in the front of the top plate.
The film advance key and frame counter window are on the bottom. The winding key locks when the film has advanced a full frame. There is a sliding catch to unlock it to advance the film the next time; operating this catch causes the frame counter to advance. There is also a covered tripod bush in the bottom.
There is a folding frame finder on the top.
- Examples sold at Westlicht Photographica Auction:
- Eka, serial no. 847 with black shutter plate, sold at the nineteenth auction, on 28 May 2011.
- Eka, serial no. 891 with black shutter plate, sold at the sixth auction, on 6 November 2004.
- Eka, serial no. 534, with tropical protective case made to special order by Krauss, sold at the eighth auction, on 27 November 2005; the camera is the standard model under the case.
- Eka at Sylvain Halgand's www.collection-appareils.fr (in French)