George Eastman was 15 years old. The young George left school early and started working to help support the family. As Eastman began to have success with his photography business, he vowed to repay his mother for the hardships she had endured in raising him. In 1884, Eastman patented the first film in roll form to prove practicable; he had been tinkering at home to develop it. In 1888, he perfected the Kodak Black camera, which was the first camera designed to use roll film. In 1889 he first offered film stock, and by 1896 became the leading supplier of film stock
Twin-lens reflex camera roll film with square 4×4 cm images, most famous the "Baby" Rolleiflex and the Yashica 44. The TLR design was also popular in the 1950s for inexpensive fixed focus cameras such as the Kodak Duaflex and Argus 75. Though most used medium format film, a few 35mm TLRs were made, the very expensive Contaflex TLR being the most elaborate, with interchangeable lenses and removable backs. The LOMO Lubitel 166+, a natively medium format camera, comes with an adapter for 35mm film. The only twin lens reflex camera that uses instant film is Instantflex TL70 manufactured by MiNT Camera which is