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Download as PDF; Printable version; ... preferred numbers ... f /1.4, f /2, f /2.8, f /4, etc. Full f-stops are a square root of 2 apart. Camera lens settings are ...
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The E series of preferred numbers was chosen such that when a component is manufactured it will end up in a range of roughly equally spaced values (geometric progression) on a logarithmic scale. Each E series subdivides each decade magnitude into steps of 3, 6, 12, 24, 48, 96, and 192 values, termed E3 , E6 , and so forth to E192 , with maximum ...
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FOSV – full-opening safety valve; FPDM – fracture potential and domain modelling/mapping [14] [15] FPH – feet per hour; FPIT – free-point indicator tool; FPL – flow analysis log; FPLP – freshman petroleum learning program (Penn State) [citation needed] FPLAN – field plan log; FPS – field production system
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The most basic R5 series consists of these five rounded numbers, which are powers of the fifth root of 10, rounded to two digits. The Renard numbers are not always rounded to the closest three-digit number to the theoretical geometric sequence: