| http://www.w3.org/ns/prov#value | - 20100231686Wide angle optical system and image pickup apparatus using the same - An optical system comprises, in order from the object side, an aperture stop, a first lens with positive refracting power, a second lens with negative refracting power, and a third lens, both surfaces of the third lens are an aspherical surface in which refracting power varies in accordance with distance from the opti
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