Coating Defects
| Defects caused by an optical element coating, such as scratches, voids, pinholes, dust, or stains, are considered with the scratch-and-dig specification for that element. coating defects are allowed if their size is within the stated scratch-and-dig tolerance. Coating defects are counted separately from substrate defects. |
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| Optics Guide Copyright 2002 Melles Griot Inc. |