Imaging lens and imaging apparatus
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United States of America Patent
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Nov 3, 2015
Grant Date -
May 8, 2014
app pub date -
Jan 9, 2014
filing date -
Jul 29, 2011
priority date (Note) -
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Abstract
An imaging lens provided with a negative first lens group and a positive second lens group arranged in order from the object side. The first lens group is composed of a first group first lens which is a biconcave negative single lens, and the second lens group is composed of a positive second group first lens, an aperture stop, a positive second group second lens, and a negative second group third lens arranged in order from the object side, in which the second group second lens and the second group third lens are cemented together to form a cemented lens. When f1 and f2 are taken as the focal lengths of the first group first lens and the second group first lens respectively, the imaging lens satisfies a conditional expression (4a′): 0.62<|f1/f2|<0.82.
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