大家買老鏡 會注意Glass邊方面問題

zale

相信好多Ching都會買老鏡 想問下大家對老鏡glass邊方面的condition 比較關注那些多些 例如haze mold hairlines separation scratch cleaning mark 等等

raumplan

my concerns would be haze, mold, separation.

to me scratches and cleaning mark is no problem unless the scratches is very severe!

LanLan

my focus is usually on separation, then mold and haze. very few technician can fix separation.

I will also check aperture blade, some old lens might have aperture blade missing.

cleaning mark, hairline and coating mark loss usually wont significantly affect pic quality.

samwu

冇霉冇霞冇離膠冇大花痕就可以

0.95

睇價錢啦。

俾premium價，真係乜都睇。
俾user價，真係影到相有公仔睇就當乜都睇唔到。

ic112

1. Haze
2. Separation
3. Mold

Pandachief

A important note, I think when you check a lens. You check it as an entire package. For example, a perfectly looking scratchless lens may be because it is over cleanned and a lot of coatings are off! I rather buy one with more coating intact and more small scratches.  You can tell how thick the coating is from the colour of the lens and if you know what colour the coating is for each lens.

Scratches can be cleaned most of the time by removing a very few layer of coating.

Also take a few pictures and see if the lens look like pics from that lens. Some very old 8 elements, for example, rumoured to have the 2 inner elements replaced and the pics will look less sharp.

On other areas, I will check seperation first as this is something that cannot be fixed easily. I will check if the lens's picture taken are what it supposed to be. Seperations can be fixed, but will often change the character of the lens and it might not be as sharp as well.

Second will check if have mold, because if not cleaned propably, will spread across to all other lens in your dry cabinet. Not worth the risk.  For any new lens purchased, best not put in the same dry cabinet as your most treasure lens. It might content mold that you are not aware of.

Haze really depends on which lens. Some I am pretty sure can clean by good cfu, some is hard to clean completely (Like old V1 rigid).

Cleaning marks etc. really depends on cost of lens and how rare the lens is.  Again, look at it as a package.  Some lens looks perfect without any scratches but some haze and you might think it is a good deal. But actually the haze covered the scratches and once cleaned it is no longer as perfect.

For a collector grade lens. I will also check if the lens have been opened before. Some lens might be tight and dry and have some naturally developed marks on lens (This is less of a concern). For a lens that is virgin and rare, I prefer not to clean it if have some minor haze.  Check the screws if have any marks, check other areas to know if it is a never opened lens.

zale

多謝各位Ching 既意見和心得 特別係panda Ching 既詳細心得同解釋 祝各Ching 以後可以買到自己既心頭好