這支鏡頭主要的問題是前鏡片滿佈刮痕，還有鍍膜變質。整片鏡片除了看起來白霧霧之外，還有密密麻麻的刮痕，這些刮痕不只傷在鍍膜上，許多都傷到了玻璃本身。
拋光處理是一種死馬當活馬醫的處置方式，不可能把傷得如此嚴重的問題"完全復原"，但至少可以大幅改善並使其表現接近原本完好的狀態。
最後兩張是拋光處理前後的實拍測試照，所有設定皆相同。 可以清楚看到拋光處理顯著改善了鏡頭的表現！
This page shows a case of polishing treatment for Carl Zeiss Jena Biotar 5.8cm f/2.0.
The major problem of this lens is the serious scratches on the front glass, and also coating deterioration make the glass looks hazy and cloudy.
Polishing treatment is the only way to rescue the lens from the desperate situation. The treatment is impossible to restore the lens back to its' original perfect condition, but the performance got a great benefit from polishing treatment and shows a significant improvement.
The last two photos are the testing sample from before and after the polishing treatment. You can clearly see the big differences.
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