| 摘要 |
<p>An optical imaging system (10) includes a first lens group (I) having a positive or negative optical power, an aperture diaphragm (S), and a second lens group (II) having a positive optical power arranged in order from an object side. The first lens group includes a first front lens group (III) having at least two negative lenses and a first rear lens group (IV) having at least one positive lens with an airspace in-between the first front and rear lens groups (III, IV). The second lens group (II) includes a second front lens group (V) having first positive and negative lenses, second negative and positive lenses arranged in order from the object side, and a second rear lens group (VI) including at least one aspherical lens. When focusing on an object in a close range from infinity, the second lens group (II) moves to the object side while an interval between the second front and rear lens groups (V, VI) are shortened.</p> |
