William Optics STC Astro Duo-Narrowband Filter - 48 mm
- TC Astro Duo-Narrowband Filter from William Optics
- 48 mm Size
- Clip Filter - Dual Band type
- Light pollution type filter
- Enhances H-alpha and Oxygen III wavelengths
- Professional Ion Beam-assisted deposition and AR-coating technology
This is a William Optics STC Astro Duo-Narrowband Filter - 48 mm size. STC Astro Duo-Narrowband filter can reduce the interference from artificial lighting (man made light pollution) in the city, and enhance the wave length of Hα and OIII. IBAD (Ion beam-assisted deposition) coating technology makes the glass higher durability and easily cleaning, and preventing aging variation in optical spectral characteristics due to temperature and humidity change. The Matte black Anodized and Teflon-coated frame design eliminates flare and is also very easy to install or remove from your lens.
Astro Duo-Narrowband filters are designed to capture specific wavelengths of gaseous and planetary nebulae. Of particular interest to astrophotographers is the Hα emission line at 656 nm and OIII lines at 500 nm, performing high transmission and rejecting light pollution as well as the important blocking of longer wavelengths. It brings more detail and contrast in your image. The professional Ion Beam-assisted deposition and AR coating technology is applied on Schott optical glass, to ensure highest possible level of durability and also excellent image quality.
Matte black anodized and Teflon-coated frame design eliminates flare and easy to install or remove from your lens.
||STC Astro Duo-Narrowband Filter - 48 mm
||Standard 48 mm diam. barrel threads
||Standard 2" eyepieces
||48 mm, Clip Filter
||SCHOTT B270 Optical Glass, Aluminum 6061 Rim
||William Optics STC
||1 mm Glass, 3.5 mm for Rim