The Krügener Delta is a German-made detective-style plate camera, produced in a 9x12cm format and a square rollfilm version. As a late-19th to early-20th-century detective camera from a Frankfurt-based maker, it was positioned as a discreet field camera for amateur photographers of its era.

At UK auction, hammer prices for the Krügener Delta have ranged from £600 to £1,375, with the two recorded sales averaging around £990 — figures that reflect wholesale saleroom levels rather than retail or dealer asking prices. Today in 2026 the model trades thinly, so any individual result is heavily dependent on configuration, completeness and condition rather than a settled market median. Collectors should treat these prices as reference points: what a Krügener Delta is worth at sale can swing widely between the detective, 9x12 plate and rollfilm variants.