Lens system and optical device having the same
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Abstract
A lens system has a plurality of lenses, a stop, and a diffractive surface, the entire lens system moves during focusing, and the lens system satisfies the condition of β≧0.5, where β is a maximum photographic magnification.
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Citations
57 Claims
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1-27. -27. (canceled)
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28. A lens system comprising;
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a diffractive surface, and a first lens unit of a positive optical power, a second lens unit of a negative optical power disposed on the image side of said first lens unit, and a third lens unit of a positive optical power disposed on the image side of said second lens unit, wherein during focusing from an object at infinity to an object at a near distance, said first lens unit is fixed, said second lens unit moves toward an image side, and said third lens unit moves toward the object side, and wherein the following condition is satisfied by said lens system;
|β
|≧
0.5,where β
is a maximum photographic magnification. - View Dependent Claims (29, 31, 32, 33, 34, 35, 36, 56)
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30. (canceled)
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37-55. -55. (canceled)
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57-58. -58. (canceled)
Specification