In photography, necessity has always been the mother of invention – and a number of very pressing needs gave rise to the Rolleiflex twin-lens reflex (TLR) camera, a design that survived for 70 years.
Around 1911, while working at the Optical Institute in Wetzlar, Germany, Oskar Barnack floated a bold idea. Struggling with asthma, the photography enthusiast found it difficult to lug around ...