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最近想買 UV filter 當為 Protector 用，一直都懷疑不同牌子 UV filters 可以有幾倍的價錢上落，表現又是不是真的差天共地？
以下一篇外國文章或者可以為大家提供少少指引：
...The first three winners will definitely be a surprise for most experienced photographers (as they were for us). Three of the top four filters are manufactured by the same firm – Hoya – which handily took first and second place. The very popular and famous MRC B+W filter was only able to gain a third place finish. The key to success appeared to be good UV ray reduction and high transmission in the visible light range. The Hoya products performed the best in this category. We definitely have to add that there couldn’t be any mistake or any subjective evaluation. Most points in our test were accumulated solely based on the parameters that were measured by the spectrophotometer, which obviously is an objective and precise piece of equipment. And the fact that the filter that costs only 79 Polish zloty earned the highest number of points is very reassuring! As far as the B+W filter is concerned we need to mention that this company offers products targeted mostly at the 415 or 420 nm radiation wave. Unfortunately, we weren’t able to find these filters from any Polish distributor and therefore we couldn’t test them.
We were very disappointed with the Heliopan products. The German filters are not only very expensive, but they also presented very mediocre optical parameters.
We were also surprised with the low 8th position of the WPC coatings used by the top model Marumi filter. Although this filter has the highest light transmission in the visible range and has a very small tendency for flares, it only barely blocks the UV radiation, which should be its primary function after all. Why would we need a UV filter which cuts out the same amount of UV radiation as a regular glass? However this filter can be useful for people, who want to protect their lens from the outer factors. Thanks to its visible range features, it will pass this part of the exam perfectly.
The last three filters – the Hoya UV G series, King UV and Tiffen UV – were no better than good quality window glass. It is cruel to say but true. During our testing we put a piece of regular glass and a very worn out lens from our colleague’s reading glasses in the spectrophotometer to compare the results. As far as the light transmission is concerned the old reading glass lens was much better than all three filters, and the regular window glass wasn’t much further behind. Too bad…
文章的測試結果是以精密的光學儀器去測試，文中稱「...there couldn’t be any mistake or any subjective evaluation. Most points in our test were accumulated solely based on the parameters...」，所以結果非常科學化、客觀。
非常令他們驚訝，排首3位的 filter 都是 HOYA，而名牌 B+W 只排在第3（第1名有兩塊），而價錢，首位的 HOYA HMC UV-O 只是 B+W 010 UV Haze MRC 的一半。
HOYA 是日本專門出鏡片的大廠，亦即是我們所熟知的 Kenko 的母公司，果然有一定水準。
原文 http://www.lenstip.com/113.1-art ... t_Introduction.html
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發表於 6-3-2012 01:18:10
發表於 6-3-2012 10:20:44
