Better Beamer

Success‚ In a Flash
Most photographers understand the benefits of using fill flash under harsh lighting conditions. Most modern cameras using either built-in flash heads or custom designed external units are capable of doing daylight balanced fill-flash.  These are are very convenient, simple to use, and can provide a high percentage of successful images.
White Faced Monkey #2‚ Costa Rica, 2001
Photographed with a Canon EOS D30 and 100~400mm f/5.6L lens @ 260mm1/30 sec @ f/6.7‚ ISO 400 using Canon 550EX flash @ -1.5 withBetter BeamerFlash Extender
For many forms of wildlife, and in particular birds, fill-flash is frequently needed but difficult to accomplish. Such photography is typically done with long lenses‚ usually between 300mm and 600mm in focal length. Even the larger external flash units run out of steam beyond about 50 ft (15 meters) because their light is being dispersed over too broad an area.
This has lead to the recent development of several different devices who...