| 摘要 |
The invention provides a TTL-phase difference AF type photographic device best suited for use on normal/panoramic size cameras, etc., which is built up of a condenser lens 3 located in the rear of a predetermined image-formation plane 2 of a taking lens 1, an aperture-stop 6 located in the rear of the lens 3 and having a pair of apertures, a pair of separator lenses 7 located in the rear of the aperture-stop 6, a photoreceptor element array 8 located at a position where light beams emanating from the separator lenses 7 form an image, and a pair of conversion lenses 9 which can be inserted in, or retracted from, a focal point detecting system, and have positive power. In the normal size state the conversion lenses 9 remain inserted in the focal point detecting system, and in the panoramic size state where they are retracted from the system, the absolute value of the focal point detecting system is made larger than in the normal size state, so that the focusing accuracy can be increased.
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