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Cyclops Optics

STC Astro Duo-Narrowband Filter 1.25" + FREE Shipping + FREE LensPen



STC Astro Duo-Narrowband Filter 1.25" + FREE Shipping + FREE LensPen

Shipping Weight:
0.20 KGS
Custom Order (please contact for delivery schedule)
Calculated at checkout

Product Description

Exclusive offer from Cyclops Optics: Besides the usual FREE Shipping Offer for most countries worldwide, now we further offer a FREE LensPen (original value US$11), allowing you to clean the surface of your optical equipment safely. In case your chosen option is out of stock, we will send another version for you.

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 1.25 inch filter (other sizes available on request)


  • Passes two major narrowband 10nm transmission lines — Ha (656.3nm) & O-III (500.7nm) at high transmission rate (~80% or above)
  • Suitable for DSLR and One-Shot-Colour Camera
  • Superb contrast for nebulosity 
  • Also available in 48mm standard size and Clip Mount version (see bottom of page)


STC Astro Duo-Narrowband Transmission Characteristics


* This diagram is for illustration purpose only

STC Technologies


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  

Interested in Clip Mount version? Sign up here!