In article <32FF4ABE.D60@uiowa.edu>, mark-s-peterson@uiowa.edu says...
>Dave Willow wrote:
>
>> In addition to the price difference, the SB-27 is more compact. With it,
>> you will have less range. The SB-27 power zooms from 24mm to 50mm where
>> the SB-26 goes out to 85mm. The guide number is 98 for the SB-27 and 118
>> for the SB-26 with the zoom set at 35mm.

>Zoom coverage of the SB-27 is actually 24-70mm. That extra 20mm of coverage
>is achieved by moving the flash to its vertical position.
[rest, including useful comment about SB-27 close-up advantage, deleted]

But I doubt that this provides more maximum output than the 50mm (horizontal)
setting - just less coverage in one direction, unlike other flashes that
truly zoom to 70/85mm (resulting in higher effective power).
Hope This Helps