Optical auxiliary system for a camera

Abstract

What is described here is an optical auxiliary system for a camera, which is arranged between a recording lens and a camera body and which comprises a relay system for projecting the image of the recording lens onto the film or the video pick-up. The invention is characterised by the provision that the relay system is so structured that it produces more than one image and that the lens disposed directly on the camera body is a zoom lens.

1 . Optical auxiliary system for a camera, which is inserted between a recording objective ( 1 ) and a camera body and which comprises a relay system consisting of the three lenses ( 3 ,  4 ,  6 ) and the zoom lens ( 7 ) for projecting the image from the recording lens onto the film ( 8 ) or the video pick-up, 
 characterised in that the lenses of said relay system ( 3 ,  4 ,  6  and  7 ) are so structured that they produce more than one image, with the object being projected into a second intermediate image plane ( 5  or B″), and that the lens disposed directly on said camera body is a zoom lens ( 7 ).    
     
     
         2 . Optical auxiliary system according to    claim 1   , characterised in that a path-folding unit ( 11 ,  13 ) is disposed between said recording lens ( 1 ) and said relay system ( 3 ,  4 ,  6  and  7 ).  
     
     
         3 . Optical auxiliary system according to    claim 2   , characterised in that said path-folding unit ( 11 ,  13 ) comprises two elements whereof at least one deflects the light path by 90°.  
     
     
         4 . Optical auxiliary system according to    claim 3   , characterised in that said one element is a front-surface reflector ( 11 ) while the other element is a path-folding element ( 13 ) with image inversion.  
     
     
         5 . Optical auxiliary system according to    claim 4   , characterised in that said front-surface reflector ( 11 ) is disposed for rotation about an axis ( 12 ) orthogonally on the optical axis ( 10 ) of the system and is rotatable relative to said recording lens ( 1 ) in such a way that an oblique object plane (Bs) will be sharply focused onto said image plane ( 8 ).  
     
     
         6 . Optical auxiliary system according to    claim 5   , characterised in that said path-folding element with image inversion is a roof system ( 13 ).  
     
     
         7 . Optical auxiliary system according to any of the    claims 3    to    6   , 
 characterised in that an element ( 11 ) is rotatable together with said recording lens ( 1 ) in such a way that the respective pivoting angle of said recording lens corresponds to twice the pivoting angle of said pivotable element.  
 
     
     
         8 . Optical auxiliary system according to    claim 7   , characterised in that said pivotable element is said front-surface reflector ( 11 ).  
     
     
         9 . Optical auxiliary system according to    claim 8   , characterised in that a prism ( 14 ) is disposed for image rotation between said first lens ( 3 ) and said second lens ( 4 ).  
     
     
         10 . Optical auxiliary system according to    claim 9   , characterised in that said prism ( 14 ) is a Pechan-type or Dove-type prism.  
     
     
         11 . Optical auxiliary system according to    claim 10   , characterised in that a gearing is provided which drives said prism in such a way that the image position will not be varied.  
     
     
         12 . Optical auxiliary system according to any of the    claims 9    to    11   , 
 characterised in that said two lenses ( 4 ,  6 ), which are disposed between said prism ( 14 ) for image rotation and said zoom lens ( 7 ), present the same configuration, and that said two lenses are disposed therebetween in symmetry relative to the centre plane.  
 
     
     
         13 . Optical auxiliary system according to any of the    claims 1    to    12   , 
 characterised in that said zoom lens ( 7 ) is a varifocal lens.