Here is a fun little trick that photographer Andrew Tihi (facebook) sent us. If you are looking for a pure white backdrop, why not walk down the street till you stumble upon a bus stop. The light coming from the illuminated sign is (almost) perfect for a quick portrait.
The secret is over exposing the sign, until it turns 100% white. In this case it was ISO1600@f/4 and 1/50.
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