Polaroid Corporation it had asked for. In 1977, Land introduced the Polaroid Instant Home Movie camera named Polavision, based on the Dufaycolor process. However, the product arrived on the market when videotape-based systems were rapidly gaining popularity. Thus it failed to sell well in retail stores and has been described as the swan song for Polaroid. After four decades as chairman, Edwin Land was coerced into resigning and leaving the corporation he had founded. He died in 1991. The "Polavision" debacle eventually caused the company to write off $89 million, including most of the manufactured products. The underlying technology of Polavision was
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