| http://www.w3.org/ns/prov#value | - 12 is a focal length of the single lens having a positive refractive power included in the first lens group, f2 is a focal length of the second lens group, fw is a focal length of the total lens system at a wide angle end, .nu.d21is an Abbe number of the lens having a negative refractive power included in the second lens group for the d-line, and .nu.d22 is an Abbe number of the lens having a posi
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