Visual testing method for evaluating chromatic aberration
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United States of America Patent
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Feb 25, 2014
Grant Date -
Dec 13, 2012
app pub date -
Jun 9, 2011
filing date -
Jun 9, 2011
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Abstract
This invention comprises a method of visually comparing the chromatic aberration in two or more optical devices. The test reveals differences in the ability of an optical product to minimize chromatic aberration, so that ideally, various colors (corresponding to specific wavelengths) will have a sharp focus at almost the same distance away from the last optical element. The method provides a consistent way to test the chromatic aberration in various optical products that is more visually observable than the process of noting the halo of colors that appears along the edge of a dark object on a light background. The test is especially geared toward comparing binoculars with different optical material composition such as ED glass (Extra-low Dispersion) or FL (Fluorite) glass to those with conventional types of glass.
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