| 摘要 |
A device for distinguishing focusing conditions of an objective lens by a plurality of optical apparatus for forming images based on respective light beams passing through different areas of a pupil of the objective lens and photo-electric transducing apparatus for sensing the degree of coincidence of the images formed by the optical apparatus. The aforesaid optical apparatus are in contact with each other increasing the amount of one of the light beams passing through the pupil of the aforesaid objective lens, which is conducted to the aforesaid optical apparatus, wherein the contacted portion of each optical apparatus is provided with light-shielding apparatus.
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