| http://www.w3.org/ns/prov#value | - Seven examples of the present invention are described below with reference to data sheets, in which 2?? denotes the real visual field of the finder covering both the wide-angle and telephoto ends, ri, the radius of curvature of the ith surface, di, the aerial distance between the ith surface and the (i+1)th surface, ni, the refractive index of the ith optical member at the d-line, and ??i, the Abb
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