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Most photographers use a camera strap while clicking pictures and here's an eco-friendly idea that capitalize on it: Adding thin solar-film across the width of the strap, so as to harness solar energy when out on the field.
The strap attached to camera consists of tiny flexible solar panels on it which enables the camera batteries to be recharging whenever the photographer is shooting in daylight. A storage battery is built into each end of the strap which stores the power produced by solar panels. The batteries inside the camera are not directly recharged using this solar strap but the built-in batteries of the strap does the work.
South China Normal University
College of Fine Arts
SANYO Technolegy Center (Shenzhen)