Wide-Flash Adapter SW-3 CD
The angle of illumination of the SB-ll 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
a28mm 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 (ASAIISO 100 and meters) to 25. The ASAIISO 25 and feet guide number is reduced from 60 to 42 .