Unverified84% confidenceTradeoffTime unknown
焦距倍率越短（TR越小）越省空间，但代价是对焦难度增大、亮度衰减更明显、成本更高。家用观影TR 0.23-0.25即可满足绝大多数客厅需求，盲目追求超低TR会大幅推高价格且实际收益有限
1
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84%
Confidence
Long-term
Relevance
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First Seen
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