| 摘要 |
A clip-on lens target (10) is disclosed which is suitable for attachment to an elongated light source, such as a fluorescent light (12). The target (10) is attached to the light source (12) by a series of clamps (20) and has a plurality of accurately sized and spaced holes (18) formed in it. Light shining through the holes (18) creates a standard light pattern which may be photographed by a camera so that photographs taken of the standard light pattern can be analyzed to determine the optical characteristics of the camera making the photographs.
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