Wide-angle - fitting viewfinder on measuring viewfinder cameras for photographic images with different focal lengths

摘要

It is a wide-angle - fitting viewfinder (1) to measuring viewfinder cameras for analog and digital far angle receptacles different image recording format with objective of different focal lengths, consisting of three lens groups (lg1, lg2, lg3), a frame - masks - unit (10) and a partially reflecting prisms designed as a combiner cube (8) is described, in which light enters on one side (4) in the viewfinder beam path (9) a first lens group (lg1) negative, the second and third lens group (lg2, lg3) positive refractive power, wherein the second lens group (lg2) from a downstream of the first lens group (lg1) arranged first lens (l3) and a light exit side (7) arranged second lens (l4), and between the lenses (l3, l4) the partially transparent prisms cube (8) is arranged and the third lens group (lg3) in a to the viewfinder beam path (9) vertical masks imaging beams gear (11) between the frame - masks - unit (10) and partially transparent prisms cube (8) is arranged.