影銀河的防光害濾鏡 - 介紹 / 作用 / 報價
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介紹當中效果最突出的:
KENKO Light Pollution Resistant Filter ASTRO LPR - Type 2
Kenko Astro LPR Type II cuts off light pollution from artificial lighting of city streets (mercury and sodium gas charging lamps), and transmits only the light spectrum of stellar objects.
Kenko Astro LPR Filter Type 2 防光害濾鏡可以去除鈉燈或汞燈等人造光引起的光害。透過Kenko防光害濾鏡就可避免都市光害造成天文攝影的干擾，提供清晰的圖像。此外，因濾鏡將特定波長的光害去除後，天文攝影的影像處理，也會容易許多。
The filter does not affect the color balance of the image.
濾鏡有特別塗層，可將部份常見的城市燈光的光波隔走，而不影響影像的色彩平衡。
注：建議初用者先獲得有關使用防光害濾鏡的的基本知識才作實際使用。
Why you need Astronomic filters?
為什麼你需要防光害濾鏡？
Often, when photographing the night sky with a long exposure the pictures happened to be overexposed or low-contrast. The reason is in camera that receives polluted light from artificial light sources of the cities. Astronomic filters effectively cut off this unnecessary light making image clear and of high-contrast.
通常情況下，用長時間曝光拍攝夜空時，畫面會變得曝光過度或低對比度。其原因是相機接收了城市中的污染光源。防光害濾鏡能有效地去除這些不必要的光源，令影像更清晰和高對比度。
Every astronomical filter has its own purpose of use and differs by specifications or light transmittance characteristics.
每個防光害濾鏡都有其使用目的和不同的規格或透光性。
Light transmission specifications
光傳輸規格
Below is a light transmission chart of Kenko Astro LPR Type II filter. Colored vertical lines indicate the points of the spectrum coming from city lighting:
Red line - gas charging mercury lamp
Green line - gas charging sodium lamps
以下是KENKO Astro LPR II防光害濾鏡的光透射圖。彩色垂直線顯示來自城市光源的頻譜：
紅線 - 氣充汞燈
綠線 - 天然氣的充電鈉燈
The chart shows that Kenko Astro LPR Type II filter cuts these spectrum of light coming directly from the street lamps.
圖表顯示，KENKO Astro LPR II防光害濾鏡能成功去除直接從路燈產生的光源頻譜。
Coating technology
塗層技術
Kenko Astro LPR Type II adopts precision coating based on Ion Assisted Deposition technology. In order to achieve the desirable coating specification each coating layer is sprayed on the surface of the filter with the help of ion particles creating coherent multilayer surface more durable, more harder comparing with the common coating.
KENKO Astro LPR II防光害濾鏡採用了由離子輔助鍍膜技術而成的精密塗層技術。為了實現理想的塗層規格，每個塗層都會噴上噴雾,透過離子粒子連結各塗層的表面, 使其更耐用，比一般塗層更為耐用及堅硬。
Restrictions on the use of lenses
對使用鏡頭的限制
Unlike Type I model Kenko Astro LPR Type II is not changing the color balance, so it is primarily designed for photography.
However, when shooting with wide and standard angle lenses color shift can occur in peripheral areas of the image. For this reason the we recommend using Kenko Astro LPR Type II filter with 100mm telephoto lenses or more (converting to 35mm film).
Below is a sample shot with wide angle lens (24 mm for 35mm full size cameras).
圖像的周邊區域可能會出現顏色偏移。基於這個原因，我們建議將KENKO Astro LPR II防光害濾鏡配以100mm或以上的長焦鏡頭使用（轉換為35mm底片）。
However, if you leave only the central area of the frame, you can see how the filter effectively suppress light pollution.
但是，當你注意畫面的中央部份時，你可以看到防光害濾鏡如何有效地抑制光污染。
Andromeda nebula
仙女座星雲
The Orion nebula
獵戶座星雲
Messier Objects (or Seven Sisters) open cluster in the constellation Taurus
梅西耶天體（或七姐妹）星團中的金牛星座
Veil nebula in Cygnus constellation (NGC 6992)
在天鵝座面紗星雲（NGC6992）
Milky Way and some deep space objects in Scorpius-Sagittarius constellation (M6-M7-M8-M20 and M21). Left cut is without Kenko Astro LPR Type II and right cut is with Kenko Astro LPR Type II.
銀河系和天蠍座，人馬座星座一些深層次的空間物體（M6，M7，M8，M20和M21）。左圖沒有使用KENKO Astro LPR II防光害濾鏡，而右圖則有使用KENKO Astro LPR II防光害濾鏡。
Shutter speed for both cuts: 30c
ISO: 3200 for left cut and 6400 for right cut
Lens: Sigma 150mm f2.8 EX
Camera: Nikon D700
Support: Sightron nano.tracker and Slik tripod
Place: Iran, Zanjan Province
Post production: Adobe Photoshop CC
KENKO Light Pollution Resistant Filter ASTRO LPR - Type 2 報價單:
http://poor.com.hk/store/index.php?route=product/category&path=18_209
影銀河的防光害濾鏡
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