| 摘要 |
A single-focus lens includes from the object side, a first lens with a positive refracting power having at least one aspheric surface, a stop, a second lens with a negative refracting power, and a third lens with a positive refracting power having at least one aspheric surface. This single-focus lens further satisfies the conditional expression of 0.3<f/f2'3<0.8, where f is the focal length of the lens as a whole, and f23 is the composite focal length of the second and third lenses.
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