The Zeiss Ikon Kolibri 523/18 is a compact German strut-folding camera for 127 roll film, introduced in the early 1930s. The Night Biotar variant was the top-tier configuration of the Kolibri line, fitted with a fast Carl Zeiss Jena Biotar lens intended for low-light photography, which positioned it at the premium end of the small-format folding market when new.

UK auction data for the Night Biotar version of the Kolibri is extremely thin: a single recorded hammer result of £800 from 2018 is the only data point available, so a meaningful price range cannot be drawn. Hammer prices at saleroom level reflect wholesale value rather than dealer retail, and as of today buyers should expect figures for clean, working Night Biotar examples to remain at the upper end of the Kolibri family because of the fast lens. Condition, lens clarity and shutter function are the dominant factors in what this camera sells for.