| 摘要 |
PURPOSE:To cut off disturbing incident light and to improve the precision of distance measurement by providing a hood for limiting the external light incidence in the front of an AF optical system and providing an interlocking means which associates the operation of a hook position switching means for moving forth and back the hood with the operation of a focus varying mechanism. CONSTITUTION:A subordinate lens 2 is used behind a main lens 1 for wide-angle photography during telephotography and those optical photography systems are incorporated in a lens barrel part 4 so that the subordinate lens 2 moves onto and away from an optical path of photography through the movement of the lens barrel part 4. A projection means 5 and a light-receiving means 6 are fixed to the front part of a camera body 9 through frame members 5c and 6c, provided externally with the lens barrel part 4 as a hood, and incorporated in the lens barrel part 4 so that they move relatively in the front-rear direction of the camera. The lens barrel part 4 is provided with a hood opening part 4a provided in front of a projection part and a hood opening part 4b which is provided in front of the light reception system of AF to cut off external disturbing light. |
