2014年8月23日 星期六

ANGENIEUX PARIS 35mm f/2.5 RETROFOCUS TYPE R1 前鏡片鍍膜刮傷 拋光 front glass coating scratches, polishing treatment

愛展能這一系列的鏡頭有一個通病,就是前鏡片很容易受傷,時常看到這些鏡頭的前鏡片鍍膜有深淺不一的刮痕。這問題,輕微者仍然可以拍照,對成像不太有影響。但是嚴重者,拍出來的照片就是霧濛濛一片,完全喪失照片該有的通透感。
這支送來回春的鏡頭,也一樣有這問題,不過它相當嚴重。刮痕不只在鍍膜上,大部份都已深入玻璃本身。在處理食,把鍍膜拋掉後,鏡片玻璃上依舊是密密麻麻的刮痕,在小心的進階拋光處理後,才把這些玻璃大部份的傷痕拋掉,留下一些真的傷得太深的傷痕。傷得太深的傷痕不能夠完全拋除,因為把深刮痕拋除,鏡片的曲度就會改變,也就沒辦法準確成像,所以,受傷的鏡片拋光,要適可而止。
這支鏡頭處理完之後,鏡片變得乾淨通透! 恭喜這支鏡頭重生了!

最後附上兩張試拍照,拋光前&拋光後。
這支鏡頭是熬夜通宵我是熬夜通宵處理的,拋光前試拍時間是正中午12:12分。 整支鏡頭處理完成組裝好是清晨五點左右,拋光後試拍照時間是清晨5:36分。 兩張照片的日照方向所產生的陰影有很大的差異,請將這部分忽略。 請比較照片的通透度與清晰度,可以看出有顯著差異! 拋光前看起來像是一支廢鏡拍的;拋光後的照片就像是一支正常鏡頭拍的!

The main problem with this lens is the front glass condition. As you can see in the photos, there has full of scratches on the front glass. The coating marks is the common issue to this series Angenieux lenses, but the lens in this page is really serious.
The scratches are not only on the coating, but also deep into the glass.
After I remove the damaged coating, there still has many scratches on the glass. I polished the glass very carefully to make the scratches disappear.  Finally, most of the scratches were polished away, and left some deeper scratches there. In order to keep the original curve shape of the glass to take accurate and sharp image, the deeper scratches cannot be polished away. Damaged glass polishing need to be stopped in the right step before going too far to change the curve shape!
After finishing all the treatment, the lens is in clean and clear condition now, and can take great photos!

I provide two sample images, "before" and "after" the treatment.
I stayed up all night to repair the lens. The "before" sample image was taken at the noon time, 12:12 PM. The whole treatment was completed early morning, and the "after" sample was taken at 05:36 AM. Please neglect the differences in the sun shadows between the two sample images. You should be able to tell the differences in the clarity and the contrast easily!















沒有留言:

張貼留言