[tl9078]

請問會不會一起用呢？
會有甚麼問題發生呢？
CPL鏡會不會可以代替UV鏡呢？
一齊用又那一塊鏡裝上先呢？
謝謝！

[Cosplay]

C-PL，原名Circular Polarizer（環形偏先鏡）。
有幾種用途：
1: 使天空睇黎更加藍
2: 去除非金屬表面的反光
3: 增加相片的飽和度
4: 可以當做減光鏡用

現在的UV鏡，多數用作保護鏡用。
不過，兩者都係唔好一齊用，
因為大部份C-PL已經好原厚，
如果再加UV一齊用，係拍攝廣角時，有機會出現黑邊。

[Cosplay]

更正：
C-PL，原名Circular Polarizer（環形偏光鏡）。
有幾種用途：
1: 使天空睇黎更加藍
2: 去除非金屬表面的反光
3: 增加相片的飽和度
4: 可以當做減光鏡用

現在的UV鏡，多數用作保護鏡用。
不過，兩者都係唔好一齊用，
因為大部份C-PL已經好厚，
如果再加UV一齊用，係拍攝廣角時，有機會出現黑邊。

先前打錯字，抱歉。

[lalung]

DSLR是否應用NC好過用UV Filter???
因為UV Filter用在DSLR上有可能偏色??
NC純保謢lens作用.
哪裡可買67 mm NC Filter??

[Rol]

Then what difference of 環形偏光鏡 and 偏光鏡 ??

Or what difference of CPL and PL ? Are they same ?

In SLR film era, i only used 偏光鏡 (PL filter).

Now i want to buy new PL filter too.

[zeusho]

To Rol:

http://photonotes.org/cgi-bin/entry.pl?id=Polarizingfilter

Also “polarising filter,” “polariser,” “polarizer.” A filter which can block light polarized in one plane. This useful property means a polarizer can cut non-metallic reflections and enhance contrast in your photos under certain conditions.

A polarizing filter is made from a thin sheet of polarizing material which is laminated between two circular pieces of glass and mounted in a frame. You can then rotate the filter while it’s fastened to the lens, affecting the filter’s angle of polarization and thus altering the amount of polarized light in the scene which can pass through. Also, regardless of angle, a polarizer reduces the amount of light entering the lens - it can act as a neutral-density filter in this regard, typically costing a little more than a stop of light.

Polarizers are useful for cutting reflections from water and glass (ie: non-metallic) surfaces. They’re commonly used for cutting reflective glare off of windows, or for taking a photo of a lake without a reflection on the lake surface, for instance. They can also be used to increase colour saturation of blue sky (since light scattered by Rayleigh scattering is polarized) and of certain types of vegetation. Note that the effect of a polarizer on the sky varies depending on the angle to the sun (Brewster’s angle). So a very wide-angle lens with a polarizer will demonstrate differing amounts of polarizing across the frame.

There are two basic kinds of polarizers - linear and circular. Linear polarizers work well with manual focus cameras, but they interfere with autofocus cameras. Circular polarizers contain another element - a “quarter wave” plate - which ensures compatibility of the filter with autofocus systems. So if you’ve got an autofocus camera be sure to use only circular polarizing filters.

P. S. may i have DS's original files? Thanks a lot!

[Rol]

Zeusho,

Thanks for advice, it seems my old PL filter is Linear type, before i used MF SLR...

If you don't mind my photo with awkward skill, will send you original file asap.

[雞能]

ND is ND, CPL is CPL,

totally different!

use either CPL or UV,

use both may dark corner,

[zeusho]

To Rol,

have you receive my e-mail reply (in Chinese)? I think i used some wrong wording in it, sorry about it,

「If you don't mind my photo with awkward skill」

i don't mind as i don't have good skills to take photos....

by the way, the DS's samples are all very good if they were in non-process status, so can i have more samples so that i can give some advice to my friend to choose which camera he should buy?

[Cosplay]

其實 NC鏡（Neutral filter with coating） 只係一塊好係好普通的保護鏡。

至於你話的PL / C-PL鏡，的確係有所分別的。
因為要講，真係好長編，連自己都唔係咁了解，所以只好草草話比你知。

使用AE / AF 的 DSLR / SLR，最好使用C-PL鏡，
由於光原有分線偏振光或圓偏振光，加上大部分的自動曝光，自動對焦的 DSLR / SLR 的反光鏡係用非金屬物質做成。
咁，線性偏振光就唔能夠通過反光鏡去完成曝光及對焦。
不過，因為圓偏振光的特性係前進時帶旋轉，所以能夠通過反光鏡去完成曝光及對焦。

[Cosplay]

補充：
因為DC冇反光鏡，測光及對焦都係真接進行，所以就算用PL鏡都得。
不過如果你有 DSLR / SLR 就唔好諗啦，買C-PL鏡一定冇錯。
冇為花錢買多一塊濾鏡。 ^^/