| 摘要 |
A variable viewfinder, for wide-angle camera shots includes three lens units. The first and third lens units, in the light direction, have negative refractive power whereas the second unit has positive refractive power. The lens units are arranged displaceably relative to one another, for changing the viewfinder magnification, in a telescope housing that includes an adaptor for insertion into a flash shoe on the camera. The first and third lens units are fixed in the telescope housing and the second lens unit is arranged in a variator that can be displaced in the telescope housing. The variator includes at least one guide pin which, through a curved track arranged in the telescope housing, engages in a longitudinal groove that runs parallel to the longitudinal axis of the telescope housing. In addition, the variator is provided in a rotating ring pushed onto the telescope housing.
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