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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.
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'.
USMC F-4 pilots claimed three enemy MiGs at the cost of one aircraft in air-combat. USAF F-4 Phantom crews scored 107 + 1 ⁄ 2 MiG kills (including 33 + 1 ⁄ 2 MiG-17s, eight MiG-19s and 66 MiG-21s) at a cost of 33 Phantoms in air-combat. [92] F-4 pilots were credited with a total of 150 + 1 ⁄ 2 MiG kills at a cost of 42 Phantoms in air-combat.
A 100 mm focal length f /4 lens has an entrance pupil diameter of 25 mm. A 100 mm focal length f /2 lens has an entrance pupil diameter of 50 mm. Since the area is proportional to the square of the pupil diameter, [6] the amount of light admitted by the f /2 lens is four times that of the f /4 lens.
Metric units are units based on the metre, gram or second and decimal (power of ten) multiples or sub-multiples of these. According to Schadow and McDonald, [ 1 ] metric units, in general, are those units "defined 'in the spirit' of the metric system, that emerged in late 18th century France and was rapidly adopted by scientists and engineers.
Metric prefixes have also been used with some non-metric units. The SI prefixes are metric prefixes that were standardised for use in the International System of Units (SI) by the International Bureau of Weights and Measures (BIPM) in resolutions dating from 1960 to 2022. [1] [2] Since 2009, they have formed part of the ISO/IEC 80000 standard.
It is also possible to install Pave Spike targeting pods and rocket pods of all sizes. [11] [13] These upgraded F-4 Phantoms are referred to as the F-4E-2020 Terminator. 54 were modernized and 30+ of them will be in service until at least 2030. [14] They first entered service on 27 January 2000 with deliveries to 111 and 171 Filo. [15] QF-4E
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 ...