Carl Zeiss S-Orthoplanar 60mm f/4.0 滿佈刮痕拋光處理 polishing treatment for heavy scratches

這篇一個拋光處理的案例

Carl Zeiss S-Orthoplanar 60mm f/4.0 是一支頂級的放大頭。不過它的前鏡片滿佈細刮痕以及嚴重的擦拭痕，這些傷痕會嚴重的影響其光學表現。所幸這些傷痕大都是鍍膜傷以及很淺層的玻璃傷，因此可以藉由拋光處理將大部份的傷痕拋除，使鏡片恢復乾淨透亮。 乾淨透亮的鏡片會使他的表現恢復原來優異的水準！

以下試拍照可清楚看到拋光處理前後的成像有顯著的差異。

拋光前的畫質會因為滿佈的傷痕使反差、飽和度與色彩表現等受到影響，使照片看起來霧矇矇的。 拋光處理之後，鏡片恢復乾淨通透，畫質表現立即恢復。

如果這支鏡頭沒有接受拋光處理，它的表現是不及格的，不管它的身價再高，都不會讓人想要將它帶出門。拋光處理讓鏡頭恢復原來水準，也算是救回了一支受傷的鏡頭！

Here is an example of polishing treatment.

Carl Zeiss S-Orthoplanar 60mm f/4.0 is a supreme enlarger lens. But this one is full of scratches and serious cleaning marks on the front glass. These damages strongly affect the image quality. Fortunately, most of the damages are superficial and can be removed by polishing treatment. Polishing treatment makes the glass clear again, and bring the lens back to its original performance.

The sample photos below show the significant differences between before and after polish.

Before polishing treatment, the images look hazy and foggy with low contrast and color saturation. After polishing treatment, the image quality got a great improvement.

If a lens in a such bad/pre-treatment condition, no matter how high the value is, no one want to use the lens. The polishing treatment rescue the lens and bring the performance back to its great level.