Nikon SB 11 User Manual download pdf (Page 18)

Wide-Flash Adapter SW-3 ©

The angle of illumination of the SB-11 by itself is 56°

horizontally and 40° vertically—wide enough for use

with a 35mm wideangle lens. When the Wide-Flash

Adapter is clipped onto the front of the flash head, it in

creases the illumination to 67° horizontally and 48° ver

tically providing just the right amount of coverage when

a 28mm lens is used. With the SW-3 attached, the light

output of the speedlight is reduced resulting in a decrease

in guide number from 36 (ASA/ISO 100 and meters) to

25. The AS7VISO 25 and feet guide number is reduced

from 60 to 42.

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Nikon SB 11 User Manual Page 18