| 摘要 |
PURPOSE:To miniaturize a teleconverter unit by forming a lens placed to a main photographic lens into one body so that this lens has three or more luminous flux transmission parts. CONSTITUTION:The lens part placed to the main photographic lens is formed into one body to have transmission parts having prescribed shapes for three or more luminous fluxes out of the photographic luminous flux, the finder luminous flux, the photometric luminous flux, and the colorimetric luminous flux. That is, a first lens 10 having a positive refracting power through which the photographic lens luminous flux, the photometric luminous flux, and the colorimetric luminous flux are transmitted and a second lens 11 having a negative refracting power are provided in a teleconversion lens unit 9 in order from the object side. With respect to the second lens 11, a photographic lens luminous flux transmission part 11a, a photometric lens luminous flux transmission part 11b, a colorimetric luminous flux transmission part 11c, and a finder correction optical convex lens part 11d are formed into one body. Since an attachment lens is set to give a prescribed function to each luminous flux and respective optical systems can be closely arranged, a camera is miniaturized and the attachment lens is also miniaturized. |
