October 2015
Beginner
362 pages
14h 38m
English
Content preview from Langford's Starting Photography, 7th Edition
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Appendix K Flash guide numbers, apertures and distance
Use Table K.1 as a quick reference for the relationship between guide number, aperture, ISO and subject-to-camera distance.
Table K.1 Flash guide numbers, apertures and distance
NB: This table assumes you are using an ISO of 100, that you are not bouncing, diffusing or zooming the flash, and that the distance measurement is in meters.
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