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2. Photo print sizes - Wikipedia

   en.wikipedia.org/wiki/Photo_print_sizes

   The alternative Super series, denoted SnR, nR Plus or nR+, has an aspect ratio of 3∶2 (or as close as possible) and thus provides a better fit for standard 135 film (35 mm) at sizes of 8 inches or above. 5R is twice the size of a 2R print, 6R twice the size of a 4R print and S8R twice the size of 6R. 4D/6D is a newer size for most consumer ...

3. Letter (paper size) - Wikipedia

   en.wikipedia.org/wiki/Letter_(paper_size)

   The precise origins of the dimensions of US letter-size paper (8.5 × 11 in) are not known. The American Forest & Paper Association says that the standard US dimensions have their origin in the days of manual papermaking, the 11-inch length of the standard paper being about a quarter of "the average maximum stretch of an experienced vatman's arms". [2]

4. Paper size - Wikipedia

   en.wikipedia.org/wiki/Paper_size

   Paper size standards govern the size of sheets of paper used as writing paper, stationery, cards, and for some printed documents. The ISO 216 standard, which includes the commonly used A4 size, is the international standard for paper size.

5. Photographic paper - Wikipedia

   en.wikipedia.org/wiki/Photographic_paper

   Advertisement for Ansco Cyko photographic paper, 1922. Photographic paper is a paper coated with a light-sensitive chemical, used for making photographic prints.When photographic paper is exposed to light, it captures a latent image that is then developed to form a visible image; with most papers the image density from exposure can be sufficient to not require further development, aside from ...

6. ISO 216 - Wikipedia

   en.wikipedia.org/wiki/ISO_216

   All ISO 216, ISO 217 and ISO 269 paper sizes (except some envelopes) have the same aspect ratio, √ 2:1, within rounding to millimetres. This ratio has the unique property that when cut or folded in half widthways, the halves also have the same aspect ratio. Each ISO paper size is one half of the area of the next larger size in the same series ...

7. Epson PX-8 Geneva - Wikipedia

   en.wikipedia.org/wiki/Epson_PX-8_Geneva

   The Epson PX-8 a.k.a. Geneva was a small laptop computer made by the Epson Corporation in the mid-1980s. It had a Z80-compatible microprocessor, and ran a customized version of the CP/M-80 operating system as well as various applications from a pair of ROM sockets which were treated as drives. [1] For file storage, it had a built-in ...