| 摘要 |
A camera provided with a triplet type lens for taking a photograph in which the first lens having a positive refracting power, the second lens having a negative refracting power and the third lens having a positive refracting power are arranged in that order from the photographic object side of the camera, and a diaphragm is located at the rear of the triplet type lens. In this camera, the longitudinal direction of the picture-taking image plane is curved onto the photographic object side, and the triplet type lens satisfy: 0.41</=P.D</=0.98 where P is the Petzval's Stun of the triplet type lens and D is the length of the diagonal line of the image plane.
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