STC Astro Duo-Narrowband enables astrophotographers to capture two narrowband emission lines simultaneously, rendering ultra high contrast nebula images even if under the influence of strong light pollution in city. This ultimate dual narrowband filter enables one-shot-colour cooled camera and DSLR users to capture narrowband signals efficiently.
- STC Duo Narrowband 48mm filter (other sizes available on request)
- STC high quality microfiber cleaning cloth
- Passes two major narrowband 10nm transmission lines — Ha (656.3nm) & O-III (500.7nm) at high transmission rate (~90%)
- Suitable for DSLR and One-Shot-Colour Camera
- Superb contrast for nebulosity
- Available in 48mm standard size and Clip Mount version (see bottom of page)
STC Astro Duo-Narrowband Transmission Characteristics
STC utilises ion beam assisted deposition (IBAD) to solidly bind the coatings onto Schott B270 glass, the very same glass used in Zeiss lenses. Such technique enhances the light transmission and also durability of the 160 layers of coating deposited to produce the advanced filter characteristics shown above.
With patented Ultra Layer® technology, both surfaces of Astro-Multispectra are coated with Anti-Smudge nano-coating to prevent dust and water from settling on the filter surface. Dew will not form and your filter is aways clean. If necessary, it's effortless to clean.
12 months warranty covering defects due to manufacturing and workmanship
|Substrate||1mm Schott B270 glass|
|Rim Thickness||3.5mm (exclusive of threads)|
|Wavelength||Hydrogen-alpha (656.3nm) & Oxygen-III (500.7nm)|
|Water droplet contact angle||>110º|
|Environmental Rating||RoHs 2.0|
|Made in Taiwan||