Principle of Operation: Reflective film stretched across a rigid 4’ diameter ring. Integral hand pump/handle
assembly creates a vacuum inside the ring, causing the reflective film to form into a smooth concave mirror that
focuses light into a 4-6” spot.
Mirror Diameter- 45”
Reflective Surface Aluminized Polymer Film
Reflective Area 11.5 Sq. Ft.
Weight 8-10 lbs., depending on configuration
Focal Length Variable, from 10' to 20'
Minimum Focal Area 4”
Time to Boil 48 Oz. of Water 15 minutes (at 900 w/msq. sunlight intensity)
Vacuum Hold Time minimum of 2 hours- always cover dish when not in use
Maximum Heat Flux 850 F
A Better Focus Co.
U.S Patent # 7,374,301