本帖最后由 陈小狗 于 2016-9-21 20:36 编辑
这几天在Google上研究摄影用的滤镜，发现老美一般用光害滤镜都是目视，找了半天也没找到摄影用的，后来我发现了这个https://www.amazon.com/dp/B001DG ... liid=I3TF0X33OPOAD7
主要功能就是
- Use this specially designed 2" astrophotography filter for deep-sky imaging from areas suffering from light pollution
- Lets you capture astrophotographs in light polluted skies with CCD or DSLR cameras by blocking up to 99% transmission of specific wavelengths responsible for light pollution while passing through vital light wavelengths for pleasing images
- Enhances contrast of all types of deep-sky objects: galaxies, nebulas, and star clusters
- Filter with metal filter cell preserves neutral color balance, eliminating need for corrective color processing later
- Enables longer astrophotography exposure times without background saturation due to sky glow pollution
只挑有用的翻译
1.用于深空摄影，减少光害
2.用于CCD和单反，阻止百分之99的光污染波段并且让重要的光波通过
3.提高所有深空目标的对比度：星系，星云，星团
4.（亮点）前面有些过于学术的词汇实在不会翻译，主要意思就是在减少光害的同时，后期的不需要调颜色。（也即是说不会偏绿，偏红？）
5.长时间曝光的情况下天空背景不会因为光污染而饱和。
开始我也是半信半疑，后来看了很多买家的评论，包括其他滤镜下的评论。比如星特朗UHC滤镜的一个评论：
I've actually returned it because it made all my images look green.
I use this one - http://www.amazon.com/gp/product ... _search_detailpage. - for LP and its really great for photography to get rid of general light pollution.
看完后觉得这东西值得一试，等以后有机会拍出照片再发报告。
补充一段Clousy Nights论坛上一位网友比较有意思的一段话：
Again, the term "UHC" belongs on only ONE filter: the original Lumicon UHC narrow-band nebula filter. This filter is in the "narrow-band" nebula filter class, along with the DGM Optics NPB filter, the Thousand Oaks Narrowband LP-2 filter, and the Orion Ultrablock narrowband nebula filter. Narrowband filters let in only the H-Beta line and the two OIII emission lines, blocking almost everything else. Narrowband filters like these tend to have FWHM (full width at half maximum) passband widths of between 23nm and 30nm, with central transmission values exceeding 89%. Despite the name, the Baader UHC-S is definiitely in the "broadband" class, as it has a primary passband that is a whopping 61.7nm wide, which will let in a lot of continuum skyglow as well as the edges of the dreaded "HP Sodium Monster" emission band of high-pressure sodium lighting. Of all the narrow-band nebula filters, I do like the DGM Optics NPB probably the most, but the Lumicon UHC is also very very good (as is the Thousand Oaks Narrowband LP-2). Clear skies to you.
看完后我查了一下资料，好像还真是这样，在亚马逊上100刀以上的滤镜（老美称便宜的UHC滤镜叫假UHC滤镜，好像因为这些很多都是宽带滤镜，真正的UHC是窄带，至少我在Clousy Nights论坛看到是这么说的），除了Lumicon UHC以外的滤镜基本没有其他滤镜敢叫UCH滤镜的。
而且能用于深空摄影的滤镜特别少，因为他们认为让彩色照片变了颜色的滤镜都不适合深空摄影。
以上如果有误请指出，互相学习。另外我本人也看不懂这个光谱的图，还请大神来解释一下原理。
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