The Mackenstein Folding Camera in the gate-type 13x18 configuration is a French large-format folding plate camera using the 13x18 cm sheet format. Mackenstein was a Paris-based maker active in the late 19th and early 20th centuries, and gate-strut folding cameras of this kind were positioned as portable field instruments for plate photography.

Auction evidence for this Mackenstein folder is thin: the only documented UK saleroom result is a single hammer price of £460 in 2013, so the working reference value today sits around that figure rather than any tightly defined range. Because hammer results exclude buyer's premium and seller's commission, what a comparable example sells for at retail can run noticeably higher, and condition of the bellows, ground glass and woodwork drives most of the variance in what these cameras are worth.