如下圖可看到，這支鏡頭的膠合鏡組都是三片一組黏合的設計，前後各一組膠合鏡組。這支出問題的是在前膠合鏡組的其中一個膠合面，處理上，沒辦法只分離一個膠合面，所以三片鏡片全部分開之後，再重新黏合，並補上鏡壁的避光黑漆。
重新膠合時的精準對位，確保光軸不便宜，使成像保持原來水準！
This case, Leica R 21/3.4, shows the treatment for the separation of the front cemented triplet.
The signs of separation happened to one of the two cemented layer of the triplet. The process is to take out the triplet, take apart the cemented group into individual glasses, clean the residual glue, re-cement the three piece of glass into one group, and re-paint the black paint to the sidewall.
Precise collimation during re-cementing process to ensure the image quality the same as its original performance.
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