| 摘要 |
A masking-amount guide device for a stereo slide can verify suitable masking amount by observing a stereo slide film strip with the following constitution. Projection lenses 13R and 13L and focusing plates 14R and 14L are provided in a frame 54, a film guide 16 is disposed at the rear. Lens boards 52R and 52L are respectively engaged with the guide slots 55R and 55R of the frame. The right and, left guide slots are obliquely moved symmetrically to the optical axis, the lens boards are obliquely moved by the rotation of a cam shaft (25) so that the inner edges of the focusing plates are always brought into agreements with the inner edges of the projection pictures irrespective of the projection magnification. The cam shaft is rotated while observing the images of the focusing plates so that the images are observed at the back of the same plane or pattern as the collimation pattern of the focusing plate. When the number of a dial mounted at the cam shaft is observed, the number of the stereo slide mount of optimum picture masking factor is observed.
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