| 摘要 |
PROBLEM TO BE SOLVED: To provide a small-sized camera capable of accurately detecting a focusing state without causing a parallax by providing a luminous flux splitting device between a front group and a rear group and arranging a focusing state detecting element at the inside of a finder optical system. SOLUTION: A photographic optical system is constituted of the front group L1, a half mirror HM1 and a photographic system rear group L2. The finder optical system is constituted of the front group L1, the half mirror HM1, a total reflection mirror AM2, a finder system rear group L3 and an eyepiece LE. The half mirror HM1 splits a luminous flux made incident on the photographic optical system into a photographing luminous flux being a transmitted luminous flux and a finder luminous flux being a reflected luminous flux in the midst of the photographic optical system. The half mirror HM3 is arranged between the finder system rear group L3 and a primary image surface 11, and the focusing state detecting element SF detecting a focusing state using a luminous flux split by the half mirror HM3 is arranged. Thus, the focusing state is detected while film is exposed. |
