Narrowband imaging has become quite popular in recent years with the development of highly selective filters which block specific wavelengths of light. Besides Hydrogen Alpha (H-Alpha), and Oxygen (OIII), you also have Sulfur (SII), which only allows the light at 672nm wavelengths to pass through. When combining these three color channels together when imaging with a monochrome camera, interesting results can be achieved, including the famous “Hubble Palette''. If you are interested in narrowband imaging and are shopping for a high-quality Sulfur or “SII” filter, the Astronomik has you covered! From a low-cost 1.25” SII 12 nm filter to a 6nm clip filter for your Canon, Nikon, or Sony DSLR, you will find it all here at High Point Scientific!
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If you are just starting in the exciting world of narrowband imaging and are looking for a high-quality filter that won't empty your wallet, take a look at Astronomik’s highly popular SII 12 nm CCD Filter - 1.25" - SII-1! Made in Germany and providing up to 99% transmission, this filter blocks unwanted wavelengths in the visible and IR parts of the spectrum, and with multi-layer coatings to protect it from the impacts of scratching, aging, and high humidity, you can expect both long life and incredible performance!
Providing incredible contrast and no annoying ghosting, Astronomik’s MaxFR SII 6 nm CCD 1.25" filter is designed to work perfectly with fast optical systems such as Celestron’s RASA and the Epsilon Astrographs made by Takahashi. This highly selective 6nm filter is an excellent choice under heavy light pollution when imaging super faint objects that require maximum contrast.