| 摘要 |
An image pickup lens system includes a lens 1 of a meniscus shape having a first face as a <?delete-start id="DEL-S-00001" date="20090217" ?>convex<?delete-end id="DEL-S-00001" ?> <?insert-start id="INS-S-00001" date="20090217" ?>concave <?insert-end id="INS-S-00001" ?>face, and a diaphragm 2 disposed on an object side of the lens 1. The lens 1 meets the following conditions: Y'/fl equal to or larger than 0.6; Dt/Dc is equal to or smaller than 0.9 and equal to or larger than 0.5; and Ap2/Am2 is equal to or larger than 0.9. Thus, even when an image pickup element is of a reduced size, a desired optical performance can be maintained, and it is possible to produce a lens easily with a back focal length ensured.
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