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. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 38, 44, 45, 46, 48, 56)
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37. (canceled)
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39-43. -43. (canceled)
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47. (canceled)
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49-55. -55. (canceled)
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57-58. -58. (canceled)
Specification