The Fairchild K-20 is a large-format aerial camera produced in the United States during the Second World War for hand-held use from aircraft. It exposes 4x5 inch frames on roll film and was issued in significant numbers to US military photographic units in the 1940s.

Sales data for the K-20 is thin: a single UK auction hammer result from April 2023 shows the camera selling for £60, which sits at saleroom wholesale level before commission. With only one data point to work from, today's value for a comparable example is best treated as broadly in line with that £60 figure, and condition, completeness of the film magazine, and presence of the original handle will materially affect what one sells for.