Optical system and imaging apparatus including the same
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United States of America Patent
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Oct 31, 2017
Issued Date -
N/A
app pub date -
Apr 19, 2016
filing date -
Apr 24, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
An optical system includes, in order from an object side toward an image side, a first lens unit having positive refractive power, and a second lens unit having negative refractive power. A distance between consecutive ones of the lens units changes when focusing is performed. The first lens unit is stationary during focusing. The second lens unit is moved toward the image side when focus is changed from an object at infinity to an object at a short distance. Lateral magnification β2 of the second lens unit when focusing on the object at infinity, focal length f1 of the first lens unit, and focal length f2 of the second lens unit are set appropriately to satisfy predetermined mathematical conditions.
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