Polaroid Corporation a "juggernaut of innovation", in many respects Polaroid was the Apple of its time with a "leader in Edwin Land, a scientist who guided the company as the founding CEO for four decades". Polaroid’s initial market was in polarized sunglasses — spawned from Land’s self-guided research in light polarization. Land, having completed his freshman year at Harvard University, left to pursue this market, resulting in Polaroid's birth. Land later returned to Harvard to continue his research. Polaroid, owning patents to its polarizer technology, got its start by employing polarization in products that included 3-D movies and glare-reducing goggles for dogs.
History of the single-lens reflex camera 220 film to produce 6 cm × 6 cm (2" × 2") negatives. They also produce other film backs which produce a 6 cm × 4.5 cm image; a back which uses 70mm roll film, a Polaroid Back for instant 'proofs' and even a 35mm film back. Pentax produces two medium-format SLR systems, the Pentax 645, which produces a 6 cm × 4.5 cm image; and the Pentax 67 series, which system evolved from the late 1960s introduced Pentax 6 × 7 camera. These Pentax 6 × 7 series cameras resembled huge 35mm SLR camera in look and function. In