Optical system and image pickup apparatus including the same
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United States of America Patent
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Aug 16, 2016
Grant Date -
Apr 9, 2015
app pub date -
Sep 22, 2014
filing date -
Oct 3, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
An optical system includes, in order from object side: a positive first lens unit; and a positive second lens unit moving during focusing. The second lens unit includes, in order from object side, a front unit, an aperture stop, and a positive rear unit. The first unit includes a negative lens that has a convex surface facing object side and is arranged closest to object side, and three or more positive lenses on image side of the negative lens. A distance, on optical axis, from a lens surface on object side of a second positive lens counted from image side of the three or more positive lenses to a lens surface closest to image side of the first unit, and a distance, on optical axis, between a lens surface closest to object side and that closest to image side of the first unit are each appropriately set.
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