WIDE ANGLE LENS HAVING LONG BACK FOCUS

摘要

PURPOSE: To provide a wide angle lens having high optical performance which has a long back focus and is most suitable for a camera using a high density solid image pickup element. ;CONSTITUTION: This lens has a first lens group G1 having negative power and a second lens group G2 having positive power. The first lens group is formed of a first lens of positive lens; a second lens of negative meniscus lens having a convex surface on object side; and a third lens of negative lens having a concave surface on the object side and having the stronger power in the image-side surface than in the object-side surface. The second lens group includes a meniscus lens consisting of a single lens or bonded lens having a concave surface on the image side as the lens component on the most object side, and a third lens group G3 is formed of a bonded meniscus lens having a concave surface on the object side, and at least one positive lens.;COPYRIGHT: (C)1995,JPO