The Mentor Nachtreflex (Night Reflex) is a German-made large-format SLR plate camera produced by Goltz & Breutmann of Dresden, designed for low-light photography with an unusually fast f1.9 lens. It dates to the early twentieth century and was positioned as a specialist tool for available-light and night work when most plate cameras of the era relied on much slower optics.

Auction hammer results for the f1.9 Nachtreflex are scarce, with the two recorded UK saleroom results ranging from £410 to £1,100 and a midpoint around £780. As of today the model trades thinly at auction level, so what a given example is worth and sells for depends heavily on completeness, the condition of the fast lens and shutter, and provenance; those are wholesale hammer levels rather than retail dealer prices.