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

image

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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