Imaging lens and imaging apparatus
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United States of America Patent
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Oct 17, 2017
Issued Date -
N/A
app pub date -
Nov 23, 2015
filing date -
Nov 25, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
An imaging lens is substantially constituted by: a negative first lens group; a positive second lens group; an aperture stop; a positive third lens group; and a negative fourth lens group; provided in this order from an object side. The first lens group is constituted only by two or more negative lenses. The second lens group has a positive lens at the most object side thereof. The third lens group has a negative lens having a concave surface toward the object side at the most object side thereof. The fourth lens group is constituted by a single negative lens. The fourth lens group moves from the object side to an image side when changing focus from an object at infinity to an object at an extremely close distance. Only the fourth lens group moves during focusing operations.
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