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F4 [15] is a paper size 210 mm × 330 mm (8.27 in × 13.0 in). [16] Although metric, based on the A4 paper size, and named to suggest that it is part of the official ISO 216 paper sizes, it is only a de facto standard.
ISO paper sizes in millimetres and in inches; Size A series formats B series formats C series formats name mm inches name mm inches name mm inches −2 4A0: 1682 × 2378: 66.2 × 93.6
A non-standard F4 paper size is common in Southeast Asia. It is a transitional size with the shorter side of ISO A4 (210 mm, 8 + 1 ⁄ 4 inch) and the longer side of British Foolscap (13-inch, 330 mm). ISO A4 is exactly 90% the height of F4. This size is sometimes also known as (metric) 'foolscap' or 'folio'.
The following table is adapted from the scale of the American Library Association, [1] [9] which uses a basis sheet of 19-by-25-inch (483 by 635 mm) [10] which is, confusingly if not explained by the source, half the text/book stock sheet of 25-by-38-inch (635 by 965 mm), and in which size refers to the dimensions of the cover (trimmed pages ...
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 ...
F4, a paper size; F 4 Frösön, a former Swedish Air Force wing; f/4, an f-number of an optical system such as a camera lens; F-4 Object, or Rákosi bunker, a formerly secret nuclear shelter in Budapest, Hungary; Form F-4, an American form used to register securities; Nikon F4, a camera; F4, a tornado intensity rating on the Fujita scale
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Originally in 1945, the divisions were based on the ring inside diameter in steps of 1 ⁄ 64 inch (0.40 mm). [6] However, in 1987 BSI updated the standard to the metric system so that one alphabetical size division equals 1.25 mm of circumferential length. For a baseline, ring size C has a circumference of 40 mm. [7]