It possesses irregularity rugged power distribution from body side, it offers the image pickup optical system which to compact is converted relatively vis-a-vis image size. From body side the 1st glass lens group which consists of the negative single glass lens (G1), the positive single glass lens (G2a) with the negative single glass lens (G2b) with the 2nd glass lens group junction (G2), it squeezes to sequence and it forms image pickup optical system (S), the positive single glass lens (G3a) with the negative single glass lens (G3b) with the 3rd glass lens group junction (G3), the 4th glass lens group which consists of the negative single glass lens (G4) due to. The image formation aspect (IP) the largest image high IH in, the image formation aspect (IP) when the chief ray which faces to the largest image high position in the 1st glass lens group (G1) incidence doing, when incident height hF and the same chief ray the 4th glass lens group (G4) from radiation doing, when designating radiation height as hR, 0.37
