最近遇到了一个无法正确计算Strehl Ratio的例子，经过多番排查发现是因为系统存在渐晕+使用GQ光瞳采样方式。
请留意帮助文档中这段说明：
The Analyze Tab (sequential ui mode) > Image Quality Group > RMS > RMS vs. Field
有渐晕系统的RMS计算建议采用RA光瞳采样
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