Zoom lens and image pickup apparatus including the same
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United States of America Patent
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Jan 30, 2018
Issued Date -
N/A
app pub date -
Apr 8, 2016
filing date -
Apr 16, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
Provided is a zoom lens, including: a negative first lens unit; an aperture stop; and a positive second lens unit, in which the first and second lens units are configured to move so that an interval between the first and second lens units is changed in an optical axis direction, in which the second lens unit includes a positive lens and a negative lens, and in which, when refractive indices of a material with respect to a wavelengths of 400 nm, 1,050 nm and 1,700 nm are respectively represented by Ns, Nm and Nl, and a relative partial dispersion θ of the material is expressed as: θ=(Ns−Nm)/(Ns−Nl), an average value θIR(G2p)AVE of relative partial dispersions of materials of the positive lens in the second lens unit, and an average value θIR(G2n)AVE of relative partial dispersions of materials of the negative lens in the second lens unit are appropriately set.
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Cited Art Landscape
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