| 摘要 |
Two lenses (44L,44R) are mounted on independent lens boards (42L,42R) and distance between board is change by back-and-forth motion. Loci of lenses are left and right straight or arcuate lines connecting positions where distance between optical axes of lenses are at infinite focal point is less than pitch between exposed pictures and positions where distance between axes is same as when two visual fields are in agreement at shortest focal point. |
