Unverified78% confidenceCautionTime unknown
不建议为1.6x/1.5x的"焦距增益"选APS-C当长焦机：等效焦距变长但景深与进光量不变，且裁切损失广角端，真正需超长焦应配长焦镜头而非依赖裁切系数
1
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78%
Confidence
Long-term
Relevance
-
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