Retrofocus wide-angle lens
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United States of America Patent
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Sep 14, 2004
Grant Date -
Jul 24, 2003
app pub date -
Dec 26, 2002
filing date -
Jan 17, 2002
priority date (Note) -
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Abstract
A retrofocus wide-angle lens is formed of only three lens groups, in order from the object side, a first lens group of negative refractive power, a second lens group that includes a stop, and a third lens group of positive refractive power. The first lens group is at the object end of the retrofocus wide-angle lens and includes, in order from the object side, a plurality of negative lens components and a plurality of positive lens components. The first lens group includes three lens groups with particular lens features, the first of which, from the object side, also includes two lens groups with particular features. Various combinations of lens elements satisfy two conditions for ratios of absolute values of focal lengths for the various combinations of lens elements that assist in achieving excellent imaging.
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