Abstract: The present invention relates to a macro zoom lens capable of taking a close up photograph at the one end at which a wide lens effect is obtained and at the other end at which a telephoto lens effect is obtained. One or two groups of the movable lenses in the zoom lens move in a movable direction along the optical axis at the one end at which a wide lens effect is obtained. At the other end, a telephoto lens effect is obtained. The distance between each lens and its next lens in the zoom lens in the ordinary zooming state is small as compared with the distance between the corresponding lenses at the time of taking a close up photograph.

Abstract: A light meter arrangement for a camera having a zoom objective and a view finder. A beam splitter is arranged between the zoom control lens assembly and the relay lens to split off a fraction of the beam of light coming from the assembly and to direct the fraction of afocal form to the view finder. In order to deflect an integral marginal portion of the view finder light beam to a light-sensitive element, there is provided a single prismatic entity having an entrance face positioned adjacent the exit face of the beam splitter. This entity is constructed to have a number of total reflection surfaces arranged to function as a condenser for the light rays passing therethrough.

Abstract: The present invention relates to a macro zoom lens capable of taking a close up photograph at the one end at which a wide lens effect is obtained and at the other end at which a telephoto lens effect is obtained. One or two groups of the movable lenses in the zoom lens move in a movable direction along the optical axis at the one end at which a wide lens effect is obtained. At the other end, a telephoto lens effect is obtained. The distance between each lens and its next lens in the zoom lens in the ordinary zooming state is small as compared with the distance between the corresponding lenses at the time of taking a close up photograph.

Abstract: A retrofocus wide-angle objective lens having a range of at least 75.degree. with a large relative aperture and which is corrected for various aberrations and particularly curvature of field at the outer portions of the viewing field.