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作為間隔環的替代措施，向光學系統的相機端加入一個負焦距鏡頭可減小視場，同時維持原始的工作距離規格。例如，將焦距增加2倍同樣可將視場減小兩倍。因此，2X擴展鏡可將25mm焦距鏡頭轉換成50mm焦距鏡頭。專為 C 接環視訊鏡頭而設計。
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