| 摘要 |
A viewfinder informs the photographer when a camera is tilted relative to a subject to be photographed. The viewfinder includes a pair of front and rear openings optically aligned to view the subject through the two openings, and a translucent element surrounding the front opening to permit a halo of light around the front opening which can be seen through the rear opening. The rear opening is dimensioned sufficiently smaller than the front opening to prevent one from viewing through the rear opening various portions of the halo of light depending on whether the camera is tilted up, down, right or left. Thus, one is alerted when the camera is tilted relative to the subject.
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