原價：HK$2570
【IDAS GNB 濾鏡（星系星雲增強器）】
星系和星雲的細微光線更加強烈、更加生動——IDAS的「GNB DZ」是一款窄帶濾鏡，不僅能捕捉星雲，還能捕捉星系和星團等具有連續光譜的天體。獨特的光譜設計實現了良好的色彩平衡，同時在 Hα 和 OIII 區域提供了高透射率。
此型號專為相容於佳能原廠 EF-EOSR 嵌入式轉接環和美科 EF-R/E 嵌入式支架的「DRT 型」設計，實現了高效、高畫質的後置配置，無需每次更換鏡頭時都更換濾鏡。
[特點]
・支援 Hα / OIII 等主要發射線，具有良好色彩平衡的窄帶描繪
・可以捕捉自然色彩的星系和連續光譜物體
・兼容佳能 / 名家卡口適配器
・無論使用何種鏡頭，都可以巧妙地安裝在後側
・日本製造，高精度光學玻璃，AR 塗層
[規格]
・濾鏡類型：DRT型（僅適用於嵌入式後置卡口）
・有效直徑：45mm
・厚度：2.0mm
・透射特性：Hα / OIII 雙波段 + 紅外線波段
・表面處理：二向色塗層 / AR 塗層
・想要避免為每個鏡頭更換濾鏡的麻煩的人
・想要在窄帶中拍攝星雲、星系和星團等主題 想要的色彩組合的色彩創造方式的人想要
在窄帶中拍攝星雲、星系和星團等主題的色彩結構的人 所產生的色彩OIII 的人
・已經擁有正品佳能或 Meike 嵌入式支架的人
・想要高品質、無暈輪星雲描繪的佳能和索尼無反光鏡可換鏡頭用戶
Feature
The IDAS GNB filter passes through the Ha and OIII regions in the same manner as of the IDAS NBZ to suppress light pollutions in the visible light regions. Unlike any other filters available in the market, the GNB at the same time passes through the near infrared region intended for shooting galaxies that cannot be shot with any comventional nebula filters. The idea of designing this filter is based on the fact that the near infrared region can be hardly affected by artifical light pollution sources.
Notes:
We recommend the use with a NIR-enhanced sensor such as IMX585 and IMX464 especially where the GNB is used in a heavly light-polluted location.
The GNB filter will enhance the colorfulness of galaxies when used with a conventional sensor (such as IMX294).
n.b. on halos:
Optical filters such as IDAS GNB and DTD utilizing infrared tend to cause haloing in the NUV and NIR regions. This is because the anti-reflection properties of off-the-shelf cameras' optical systems (oiptical window and sensor cover glass) are optimized for the visible spectrum only, not for the NIR region. Thus, haoling at the camera end in the unoptimized region becomes more apparent, coupled with haloing from the filter itself.
Here is a rough estimation of the magnitude of haoling where the haloing maginute of NBZ (NBZex) is counted as 1:
GNB + IMX294 sensor results in 8.0 times
GNB + IMX585 sensor results in 6.3 times
| *This product is an interference filter. Its spectrum characteristics will be subject to the incidence of incoming light. |
| When the GNB filter is placed between the lens and the camera: |
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705c-GNB-30sx100.png)
585GBN-2mx150.png)
