Baader Planetarium U-Filter 2"
since: 2018/10/15
update: 2018/10/15
reference:
1. Baader Planetarium U-Filter 2" (Venus, Ultraviolet, ZWL 350nm) FUV-2
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Overview
概觀
The Badder Venus Filter enables amateurs to successfully image in the deep UV, a spectral region normally inaccessible. The latest coating technologies permit the Baader Venus Filter to transmit from 300nm to 400nm, with a peak transmission of 80%! The filter completely blocks the rest of the region from 200nm to 1500nm, through the use of a complex 20 layer dielectric coating stack, on top of a special optically polished UG-11 substrate. Until now, amateur efforts typically relied upon deep violet colored filters, or combinations with simpler interference filters, which do not provide the high transmission and efficient rejection outside the important spectral region from 320nm to 390nm. Given the poor transmissions of many optics in the UV and the lower sensitivity of some CCDs to this wavelength, high filter efficiency and complete rejection at longer wavelengths becomes paramount to recording good contrast at reasonable exposures. The same high optical quality and features as the other Baader filters ensures the highest contrast and sharpest images possible.
Badder Venus過濾器使業餘愛好者能夠在深紫外線中成功成像，這是一個通常無法進入的光譜區域。最新的塗層技術使Baader Venus濾光片能夠從300nm傳輸到400nm，峰值透射率達到80％！通過在特殊的光學拋光UG-11基板上使用複雜的20層介電塗層疊層，濾光片完全阻擋了200nm至1500nm的其餘區域。到目前為止，業餘工作通常依賴於深紫色濾色器，或者與更簡單的干涉濾光器的組合，這些濾光器在320nm至390nm的重要光譜區域之外不提供高透射率和有效抑制。鑑於UV中許多光學元件的傳輸較差以及某些CCD對該波長的靈敏度較低，在較長波長下的高濾波器效率和完全抑制對於在合理曝光下記錄良好的對比度變得至關重要。與其他Baader濾光片相同的高光學質量和特性可確保最高的對比度和最清晰的圖像。
The solar Calcium K-Line is also within the pass band of this filter. This opens up the exciting possibility for recording flare structures on the solar disk or edges. The Baader U Filter has become the choice of UV imagers exploring the UV world of landscape, floral and even forensic imaging. The latest 2" filter now has even higher transmission and improved out of band blocking. By using Baader's DSLR-2 filter adapter ring plus the appropriate filter step ring (HDT-Rings), UV imagers can conveniently mount the U-Filter to their camera lens. The filter cell has a standard M48x0.75 thread.
太陽能鈣K線也在該過濾器的通帶內。這開闢了在太陽圓盤或邊緣上記錄耀斑結構的令人興奮的可能性。 Baader U Filter已成為紫外線成像儀的首選，探索紫外線世界的景觀，花卉甚至取證成像。最新的2“濾波器現在具有更高的傳輸速度和更好的帶外阻塞。通過使用Baader的DSLR-2濾波器適配環加上適當的濾波器環（HDT-Rings），UV成像器可以方便地將U型濾波器安裝到他們的相機透鏡。濾光片有一個標準的M48x0.75螺紋。
This 2" astronomy filter has an M48x0.75 thread (male on one side and female on the other). To use this filter directly with camera lenses for other applications, you will need an appropriate 48-mm step up or step down ring.
這個2“天文過濾器有一個M48x0.75螺紋（一側是公頭，另一側是母頭）。要將此過濾器直接用於相機鏡頭以用於其他應用，您需要一個合適的48毫米升壓或降壓環。
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Reviews
評測
This specialty filter for UV reflectance (not fluorescence!) photography with full spectrum modified digital camera works as advertised in eliminating visual spectrum and only letting through UV light. It works well with a 365 nm LED flashlight. It is important to note, that the filter thread of this filter has a NON-STANDARD pitch, and will not thread properly with standard photographic filter thread and step-down rings. The pitch is 0.75 and not 0.5 as on photographic filters. The filter diameter is 48 mm, so less than the 2" (= 50 mm) that is indicated in the filter's name. To properly seat this filter on photographic equipment, a specialty adapter is required. Cannot provide specific source, but search the "usual places".
這種用於紫外反射（非熒光！）攝影的專業濾光片具有全光譜改進的數碼相機，可廣告用於消除可見光譜並僅通過紫外光。 它適用於365 nm LED手電筒。 重要的是要注意，該過濾器的過濾器螺紋具有非標準螺距，並且不能與標準攝影過濾器螺紋和降壓環正確連接。 在照相濾光片上，間距為0.75而不是0.5。 過濾器直徑為48毫米，因此小於過濾器名稱中指示的2英寸（= 50毫米）。要將此過濾器正確安裝在攝影設備上，需要使用專用適配器。不能提供特定的來源，但搜索“ 通常的地方“。
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update: 2018/10/15
reference:
1. Baader Planetarium U-Filter 2" (Venus, Ultraviolet, ZWL 350nm) FUV-2
Overview
概觀
The Badder Venus Filter enables amateurs to successfully image in the deep UV, a spectral region normally inaccessible. The latest coating technologies permit the Baader Venus Filter to transmit from 300nm to 400nm, with a peak transmission of 80%! The filter completely blocks the rest of the region from 200nm to 1500nm, through the use of a complex 20 layer dielectric coating stack, on top of a special optically polished UG-11 substrate. Until now, amateur efforts typically relied upon deep violet colored filters, or combinations with simpler interference filters, which do not provide the high transmission and efficient rejection outside the important spectral region from 320nm to 390nm. Given the poor transmissions of many optics in the UV and the lower sensitivity of some CCDs to this wavelength, high filter efficiency and complete rejection at longer wavelengths becomes paramount to recording good contrast at reasonable exposures. The same high optical quality and features as the other Baader filters ensures the highest contrast and sharpest images possible.
Badder Venus過濾器使業餘愛好者能夠在深紫外線中成功成像，這是一個通常無法進入的光譜區域。最新的塗層技術使Baader Venus濾光片能夠從300nm傳輸到400nm，峰值透射率達到80％！通過在特殊的光學拋光UG-11基板上使用複雜的20層介電塗層疊層，濾光片完全阻擋了200nm至1500nm的其餘區域。到目前為止，業餘工作通常依賴於深紫色濾色器，或者與更簡單的干涉濾光器的組合，這些濾光器在320nm至390nm的重要光譜區域之外不提供高透射率和有效抑制。鑑於UV中許多光學元件的傳輸較差以及某些CCD對該波長的靈敏度較低，在較長波長下的高濾波器效率和完全抑制對於在合理曝光下記錄良好的對比度變得至關重要。與其他Baader濾光片相同的高光學質量和特性可確保最高的對比度和最清晰的圖像。
The solar Calcium K-Line is also within the pass band of this filter. This opens up the exciting possibility for recording flare structures on the solar disk or edges. The Baader U Filter has become the choice of UV imagers exploring the UV world of landscape, floral and even forensic imaging. The latest 2" filter now has even higher transmission and improved out of band blocking. By using Baader's DSLR-2 filter adapter ring plus the appropriate filter step ring (HDT-Rings), UV imagers can conveniently mount the U-Filter to their camera lens. The filter cell has a standard M48x0.75 thread.
太陽能鈣K線也在該過濾器的通帶內。這開闢了在太陽圓盤或邊緣上記錄耀斑結構的令人興奮的可能性。 Baader U Filter已成為紫外線成像儀的首選，探索紫外線世界的景觀，花卉甚至取證成像。最新的2“濾波器現在具有更高的傳輸速度和更好的帶外阻塞。通過使用Baader的DSLR-2濾波器適配環加上適當的濾波器環（HDT-Rings），UV成像器可以方便地將U型濾波器安裝到他們的相機透鏡。濾光片有一個標準的M48x0.75螺紋。
This 2" astronomy filter has an M48x0.75 thread (male on one side and female on the other). To use this filter directly with camera lenses for other applications, you will need an appropriate 48-mm step up or step down ring.
這個2“天文過濾器有一個M48x0.75螺紋（一側是公頭，另一側是母頭）。要將此過濾器直接用於相機鏡頭以用於其他應用，您需要一個合適的48毫米升壓或降壓環。
---------------------------------------------------------------------------
Reviews
評測
This specialty filter for UV reflectance (not fluorescence!) photography with full spectrum modified digital camera works as advertised in eliminating visual spectrum and only letting through UV light. It works well with a 365 nm LED flashlight. It is important to note, that the filter thread of this filter has a NON-STANDARD pitch, and will not thread properly with standard photographic filter thread and step-down rings. The pitch is 0.75 and not 0.5 as on photographic filters. The filter diameter is 48 mm, so less than the 2" (= 50 mm) that is indicated in the filter's name. To properly seat this filter on photographic equipment, a specialty adapter is required. Cannot provide specific source, but search the "usual places".
這種用於紫外反射（非熒光！）攝影的專業濾光片具有全光譜改進的數碼相機，可廣告用於消除可見光譜並僅通過紫外光。 它適用於365 nm LED手電筒。 重要的是要注意，該過濾器的過濾器螺紋具有非標準螺距，並且不能與標準攝影過濾器螺紋和降壓環正確連接。 在照相濾光片上，間距為0.75而不是0.5。 過濾器直徑為48毫米，因此小於過濾器名稱中指示的2英寸（= 50毫米）。要將此過濾器正確安裝在攝影設備上，需要使用專用適配器。不能提供特定的來源，但搜索“ 通常的地方“。
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