smc PENTAX-FA* 300mm f/4.5 IF ED 膠合鏡組脫膠離膠 重新黏合處理 Re-cementing treatment to cemented lens group separation

這篇是處理一支 PENTAX-FA* 300/4.5 IF&ED 有一組膠合鏡組出現脫膠/離膠問題的記錄

要處理的是一組在光圈葉片前面的膠合鏡組，它看起來有淡淡的薄霧在兩片鏡片黏合的膠合面，在這膠合面也滿佈了類似發霉霉絲的痕跡。 將這組兩片黏合在一起的鏡片分開並清除原本變質的殘膠之後，看似霉絲的東西也一併被清理掉了。 在精準的重新黏合之後，鏡片就恢復原本的乾淨通透，順理解決這支鏡頭的問題！

This post is a record shows the treatment for a separation issue on one of the cemented lens group of PENTAX-FA* 300/4.5 IF&ED.

The target lens group is just right before the aperture blades. It looks a little bit hazy and is full of fungus-like marks between the cemented surfaces. After taking apart the doublet and cleaning off the residual glue, the fungus-like marks was been removed. The final step is to make a precise collimation to re-cement the two glasses. The result shows the separation problem has been resolved and the cemented lens group looks clean and clear again.