LEICA SUMMILUX-M 35mm f/1.4 ASPH. 11883(11874) 修復後膠合鏡組脫膠 膠合面霉蝕痕拋光 Fixing Element Separation and Cemented Surface Fungus Etching Polishing

LEICA SUMMILUX-M 35mm f/1.4 ASPH. 11874這款鏡頭有兩個常見的鏡片問題，一是後膠合鏡組會有脫膠離膠的問題，二是此膠合鏡組的兩枚鏡片的黏合面 在脫膠離膠的狀態下，常常會看到有黴菌的生長，大部分是點狀或是絲狀的霉，如果這些霉在這黏合面中長得夠久，就很可能會在其中一個黏合的鏡面上留下霉蝕痕。霉蝕痕是鏡片上永久性的傷痕，沒辦法單純透過清潔的方式去除，唯一的方法就是對這個有霉蝕痕的鏡片進行精準的拋光，拋光之後重新黏合，才有辦法讓這個膠合鏡組恢復乾淨通透。 在有霉蝕痕的狀態下，如果不先拋光，只單純的把兩枚鏡片分開、清潔之後就直接再重新黏合，霉蝕痕就會夾在兩枚鏡片中間。
LEICA SUMMILUX-M 35mm f/1.4 ASPH.有三個版本，分別是一般的黑色版11874、銀色版11883 以及鈦板11859，它們都有出現上述問題的可能性。我也曾處理過幾支FLE I 11663有相同的問題，推測non-FLE和FLE I除了光學結構相同之外，用來黏合膠合鏡組的光學膠也是一樣的，目前11663的案例比較少，可能是它們都還年輕，發病的時間還沒到，也許過幾年後就會慢慢出現相同的問題，甚至FLE II 11726/11727在十年後 可能也會有相同的問題 
這款鏡頭的後膠合鏡組，如果只是單純的脫膠離膠，就只需要按照標準的處理程序，將兩枚原本黏合在一起的鏡片分開、徹底清潔乾淨之後，便可重新黏合
如果有上述在膠合面有的霉蝕痕的問題，就必須在處理脫膠離膠的程序當中，安插一個拋光的程序，就如同這個案例一樣，在拋光完成之後，才能將兩枚鏡片重新黏合，這樣才能確保鏡片是乾淨通透的。
膠合面的拋光是需要絕對的精細準確，才能確保與原始鏡頭有一致的畫質表現。 如果有不平均或是不正確的拋光，最後兩枚鏡片是無法完美的黏合在一起的，當然 畫質也會受影響 
這個案例的後膠合鏡組，就是因為其中一枚鏡片的膠合面有明顯的霉蝕痕，所以接受了 一個膠合面的拋光 以及 脫膠離膠重新黏合兩個部分的特殊處理，從最後一張照片可以看到，處理完成之後，鏡片恢復了乾淨通透的狀態，是一次完美的修復！！ 

The LEICA SUMMILUX-M 35mm f/1.4 ASPH. (11874) commonly suffers from two main optical issues: elements separation in the rear doublet, and fungus growth between the cemented surfaces of these two cemented lenses while in a delaminated state. This fungus typically appears as spots or thread-like structures. If left long enough, it often leaves fungus etching on one of the inner cemented surfaces. Fungus etching is permanent surface damage that cannot be removed by simple cleaning; the only solution is precision polishing of the etched glass surface prior to re-cementing to allow the cemented doublet to regain its crystal-clear transparency. If you separate, clean, and re-cement the two elements without polishing out the fungal etching first, those marks will remain permanently between the elements. 

The standard Black 11874, Silver 11883, and Titanium 11859 versions of the LEICA SUMMILUX-M 35mm f/1.4 ASPH. all share the potential for this issue. I have also repaired several units of the FLE I (11663) with the exact same problem. Since the non-FLE and FLE I share the same optical design, it is likely they use the same optical adhesive for their cemented doublets. We see fewer 11663 cases right now simply because they are newer and haven't hit that age threshold yet, but we will likely see more cases emerge in a few years, and it is even possible that the FLE II (11726 / 11727) might face the same issue ten years down the road. 

If the rear doublet only suffers from separation without etching, it simply follows a standard protocol: safely separate the two joined elements, thoroughly clean them, and re-cement them. However, when fungal etching is present on the cemented surface, a precision polishing step must be inserted into the process before the elements can be re-cemented to ensure the lens is clear and transparent. Polishing a lens cemented surface requires absolute  accuracy to preserve original optical performance, as any uneven or incorrect polishing will prevent the two glass elements from mating perfectly and degrade image quality. 

In this case, one of the cemented surfaces of the rear doublet had severe fungal etching, so it underwent a specialized treatment combining surface polishing with re-cementing. As you can see from the attached photos, the doublet have fully recovered their original clarity and transparency—a perfect restoration!

Leica Super-Angulon 21mm f/3.4 修復膠合鏡組脫膠離膠 Fixing the triplet elements separation

Leica Super-Angulon 21mm f/3.4這款鏡頭的光圈葉片前、後有各有一組三枚鏡片黏合的膠合鏡組，這兩個鏡組都有可能會出現脫膠離膠的問題。此次這支Leica Super-Angulon 21mm f/3.4出問題的是後膠合鏡組，依照我建立的標準維修程序，在將鏡組取出之後，小心的將三枚原本黏合在一起的鏡片分開，徹底清潔乾淨，再精準的重新黏合，最後在鏡邊壁塗上避光黑漆。從下面的照片可以看到此鏡的脫膠離膠鏡組已經被完美的修復！
這款鏡頭除了膠合鏡組會有脫膠離膠的問題之外，內部鏡片也很容易出現薄霧，不過可以放心的是 這薄霧基本上都是可以藉由小心的清潔完全去除，讓鏡片恢復乾淨通透！

The Leica Super-Angulon 21mm f/3.4 has two sets of cemented triplet lens groups—one in front of and one behind the aperture blades. Both of the triplets are prone to elements separation. In this case, the issue occurred in the rear cemented triplet. Following my standard repair procedure, after taking out the lens group, I carefully separated the three originally bonded glasses, thoroughly cleaned them, and then precisely re-cemented them back together. Finally, the anti-reflective black paint was applied to the lens edges. As you can see from the photos below, the elements separation has been perfectly restored!
In addition to elements separation, the internal elements of this lens are also very prone to developing haze. But don't worry, this haze can generally be completely removed with careful cleaning, bringing back to clean and clear condition!

LEICA SUMMILUX-M 35mm f/1.4 Pre-A Titanium 鈦 修復後膠合鏡組脫膠離膠 Fixing the rear cemented doublet elements separation

這支鈦版的 LEICA SUMMILUX-M 35mm f/1.4 Pre-A 的後膠合鏡組有明顯的霧狀脫膠離膠的問題，依照標準的重新黏合程序，將脫膠鏡組取出、去除原本的膠、徹底的將兩枚鏡片清潔乾淨，再精準的重新黏合，最後鏡臂重新塗上避光黑漆，便完成了脫膠離膠的修復。從下面的照片中可以清楚地看到，脫膠離膠修復後，鏡片就恢復到原始乾淨通透的狀態！

This titanium LEICA SUMMILUX-M 35mm f/1.4 Pre-A suffered from noticeable balsam separation in its rear cemented doublet.  Following the standard re-cementing procedure: took out the separated elements, cleaned off all the old glue, and made sure both lenses were completely clean. Then, I glued them back together perfectly and blackened the lens edge.
As clearly shown in the photos below, the cemented doublet have been restored to its original, crystal-clear state after the repair!    

LEICA SUMMILUX-M 24mm f/1.4 ASPH. 浮動鏡組鏡片油點清潔 Cleaning the oil spots on floating elements

 這支LEICA SUMMILUX-M 24mm f/1.4 ASPH.的浮動鏡組的其中一枚鏡片的邊緣有幾滴明顯的油點需要清潔

它的浮動鏡組位於鏡片結構的後半部，需要從前端開始 把大部分的結構都拆解，才有辦法取出浮動鏡組

浮動鏡組是由兩枚鏡片構成，一枚是鑲嵌在金屬框上，一枚是用橡皮圈固定在這金屬框裡。有沾上油點的就是這枚可以單獨拆卸的鏡片

在拆鏡的過程中發現，內鏡筒有很多滲漏的潤滑油脂，這可能是造成鏡片上出現油點的原因，這些都會在拆裝過程中清除，而拆解過程中難免會觸碰到其他鏡片，這也必須在組裝過程中一併清潔乾淨

為了要清潔一枚鏡片上的油點，必須要整支鏡頭幾乎肢解，這確實是一件耗時費工的工作～ 

This LEICA SUMMILUX-M 24mm f/1.4 ASPH. came in with some noticeable oil spot son the edge of its floating element group, which sits in the rear section of the lens. To get to it, I had to strip down almost the entire structure from the front.

The floating element group holds two lenses—one embedded in the metal frame and one held in place by a rubber O- ring. The latter was the one contaminated with oil spots. During the process, I found a lot of leaked lubricant inside the inner barrel, which was likely the cause of the oil spot on the glass. All of this migrated grease will be thoroughly cleaned out during the overhaul.

Aside from degreasing the barrel, any other elements touched during the teardown will be carefully cleaned during reassembly. It’s an incredibly tedious and time-consuming job just for one tiny oil spot, but that’s what it takes to do it right!

FUJIFILM GA645W Professional 修復後膠合鏡組脫膠離膠 Fixing the rear doublet elements separation

FUJIFILM GA645W Professional 中片幅隨身機 配置了SUPER-EBC FUJINON 45mm f/4.0鏡頭

這個案例的後膠合鏡組有出現脫膠離膠的問題，處理的方式就是把有問題的鏡組分離，徹底清潔之後再重新黏合，脫膠離膠的問題就可以完全被修復

The FUJIFILM GA645W Professional, a medium format point-and-shoot camera, is equipped with a SUPER-EBC FUJINON 45mm f/4.0 lens. 

In this case, the rear cemented lens group has a problem in element separation. The repair process involves taking apart the two elements which originally cementing together, cleaning them thoroughly, and then re-cementing the elements. This procedure completely resolves the separation issue.