Imaging optical system and camera
An imaging optical system includes a first lens group, a second lens group, an aperture stop, a third lens group, and a fourth lens group, arranged in order from an object side to an image side, the first lens group consisting of a first lens, the first lens being a negative meniscus lens, having a...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | An imaging optical system includes a first lens group, a second lens group, an aperture stop, a third lens group, and a fourth lens group, arranged in order from an object side to an image side, the first lens group consisting of a first lens, the first lens being a negative meniscus lens, having a concave surface facing the image side, the second lens group consisting of a second lens as a positive lens, the aperture stop having a convex surface facing the image side, and the fourth lens group consisting of a fourth lens, having a concave surface facing the image side. The third lens group is composed of cemented lenses including a third lens that is a negative lens having a concave surface facing the object side and a fourth lens that is a positive lens having a convex surface facing the image side, the third lens and the fourth lens being cemented from the object side to the image side, the third lens group having a negative refractive power as a whole, and the fourth lens having a convex surface facing th |
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