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.

Carl Zeiss Jena Sonnar 5cm f/2.0 Collapsible Contax RF Mount 前鏡片拋光 全鏡清潔 Polishing front element, Full Cleaning

我收到這支 Carl Zeiss Jena Sonnar 5cm f/2.0 Collapsible Contax RF Mount 的時候，它的狀況並不好。 前鏡片外側面有很多刮傷擦傷痕跡，內鏡片有明顯薄霧，光圈葉片也有明顯的油漬
全鏡拆解後，鏡片與光圈組件都仔細清潔，前鏡片的外側面也進行拋光處理
最後兩張是拋光前後的試拍照，是拍照的場景特別安置幾盞對著鏡頭的光源，模擬逆光的環境，逆光環境拍照可以容易的看出鏡頭的鏡片有沒有問題。兩張試拍照的相機設定都是一樣的，也都是f/2.0全開光圈。可以清楚看出拋光前後的成像有明顯的差異。 拋光前，鏡片滿滿擦拭傷痕的逆光情況下拍照，光源周圍會有明顯的光暈外溢，整體反差與色彩飽和度都偏低，照片看起來就是髒髒的感覺；拋光之後，光源周圍光暈外溢現象大幅收斂，整體畫質乾淨，飽和度與反差都大幅提升

When I received this Carl Zeiss Jena Sonnar 5cm f/2.0 Collapsible Contax RF Mount lens, its condition was not good. The outer surface of the front element had many scratches and friction marks, the inner elements had heavy haze, and the aperture blades were oily.
After a complete disassembly of the lens, both the lens elements and the aperture assembly were carefully cleaned, and the outer surface of the front element was polished.
The last two images are test shots taken before and after the polishing. For these shots, a specific scene was set up with several light sources pointed directly at the lens to simulate a backlit environment. Backlighting is an effective way to easily reveal any issues with the lens elements. The camera settings were identical for both test shots, and both were taken at a wide-open aperture of f/2.0.
The results clearly show a significant difference in image quality before and after polishing:

• Before polishing: With the element full of scratch marks, the backlit photo showed significant flaring (light halo overflow) around the light sources, and the overall contrast and color saturation were low, making the photo look "dirty."

• After polishing: The light halo phenomenon around the light sources was substantially reduced, the overall image quality is clean, and both saturation and contrast have greatly improved.