Astro Duo-Narrowband Filter
Astro Duo-Narrowband filter is designed to capture specific wavelengths of gaseous and planetary nebulae. Of particular interest to astrophotographers is the Hα emission line at 656nm and OIII lines at 500nm, performing high transmissions 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 higher durability and excellent image quality.
|Available Size||48, 77 mm, Clip Filter|
|Material||SCHOTT® B270 Optical Glass, Aluminum 6061 rim|
|Thickness||1mm glass, 4.5mm rim|
|Weight||12g(Ø: 48mm)/29g(Ø: 77mm)|
|Depth of CS||20~35μm (350MPa)|
|Water drop contact angle||＞110°|
|Multiple coating||Both-sided, Total 74 layers|