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This William Optics STC Astro Multispectra Filter is made to work specifically with DSLR cameras. It works great for general-purpose light pollution reduction by blocking the mercury and sodium emissions and letting important nebula emissions pass through. It also can enhance the Hα, Hβ, OIII and SII wavelengths. If you are looking for a filter that will boost contrast, then you have found it.
The filter is coated using Ion Beam-Assisted Deposition (IBAD) technology and uses Schott® B270 optical 2mm glass. This means that the lens can be easily cleaned and helps fight age changes from temperature and humidity. As an added bonus, this WO filter has a high-quality and double-sided NANO Anti-smudge coating to keep the filter water and grease proof.
The filter is CNC machined and the frame is matte black anodized and Teflon-coated. This helps eliminate flare and makes the filter easy to install and remove.