The Delta has a simple I/B everset shutter with a focusing lens on a collapsible lens tube. The focus is set by a ring on the body-end, or rear-end, of the tube, rather than the more usual control at the front. To open the camera, a latch which looks like the film advance wheel (but at the other end) is rotated, and the top-plate is removed from the shell. The film spool carrier is attached to the top plate; the lens tube is mounted on the body shell. Image format is 4x6.5cm, using a Biaplan 70mm f8.8 lens.