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Kern Aaran Switar 50mm f/1.8 (Alpa) $9200
Kern 50mm 有好幾个版本,由最早至晚期:
1)Kern switar 50/1.8 螢石鏡片
2)Kern-macro switar 50/1.8 螢石鏡片
3)Kern-Switar 50/1.9 gold coating
4)Kern-Macro Switar C 50/1.9 (M42)
四支全部都係 APO Standard Design.
what's the difference?
50 1.8 分兩个版本,一隻叫M...
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