When the formulas are applied, the scale of the observation system due to the large focus aperture Angle must be enlarged, or else the empirical formula will be invalid.
在实际应用中，由于聚焦孔径角加大，观测系统范围也必须相应加大，否则经验公式失效。
When the formulas are applied, the scale of the observation system due to the large focus aperture Angle must be enlarged, or else the empirical formula will be invalid.
在实际应用中，由于聚焦孔径角加大，观测系统范围也必须相应加大，否则经验公式失效。
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