Roll film of Peter's camera. David Henderson Houston (born June 14, 1841; died May 6, 1906), originally from Cambria, Wisconsin, patented the first holders for flexible roll film. Houston moved to Hunter in Dakota Territory in 1880. He was issued an 1881 patent for a roll film holder which he licensed to George Eastman (it was used in Eastman's Kodak 1888 box camera). Houston sold the patent (and an 1886 revision) outright to Eastman for $5000 in 1889. Houston continued developing the camera, creating 21 patents for cameras or camera parts between 1881 and 1902. In 1912 his estate transferred the remainder
Kodak DCS 300 series cameras had different sized CCD imaging chips, both of which were smaller than either 135 film or APS-C film frames. The 315's imager had a crop factor of 2.6 relative to 135 film ("35mm"), while the 330's was larger with a factor of 1.9. The Kodak modification to the Pronea 6i involved removing the camera's film back and mounting instead a Kodak digital back. This not only covered the back of the camera, but also extended beneath it, approximately doubling the camera's height. This was required to accommodate the large PC cards used as storage media, the six AA batteries