Unverified82% confidenceFactTime unknown
周期误差（PE）是衡量追踪精度的关键指标：入门便携机型PE通常在±40-60角秒，中端机型可做到±20角秒内。焦距超过300mm且不做导星时，PE应低于±20角秒才能保证画面锐利
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