| 摘要 |
A lens system comprising, as viewed from the object side, a first positive lens member having its convex surface facing the object side, a second positive lens member having its convex surface facing the object side, a third lens member, and a fourth positive lens member. The distance between the surface of the first lens member which faces the object side and the surface of the third lens member which faces the image side is from 0.4 times to 0.53 times the distance between the surface of the first lens member which faces the object side and the surface of the fourth lens member which faces the image side. The third lens member may comprise a positive lens and a negative lens which are joined together and which satisfy additional conditions.
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