| 摘要 |
A retrofocus type super-wide angle objective lens system usable with a single-lens reflex camera includes a divergent group forming the forward part of the lens system, a quasi-symmetric group disposed behind the divergent group having a diaphragm disposed intermediately thereof, and a convergent group forming the rearward part of the lens system. The satisfactory correction is made both of the negative distortional aberration inherent to the retrofocus type lens and the curvature of meridional plane resulting from the correction of said negative distortional aberration, thereby providing an angle of field ranging from 100 DEG to 110 DEG and a relative aperture of F/5.6 or higher brightness.
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