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99484794:制冷的話,波段不一樣,選材就不一樣,冷光闌靠后,光學結構完全不一樣了, {Aj}s3v 長波就做長波的,你F/#至少得1.4以內(nèi),一般是1.0 (2017-09-01 17:25) \NS\>Q+d