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Cyclops Optics

STC Astro Duo-Narrowband Clip Filter (Fujifilm X Series) + FREE Shipping + FREE LensPen

HK$2,950.00 HK$2,250.00
(You save HK$700.00)


STC Astro Duo-Narrowband Clip Filter (Fujifilm X Series) + FREE Shipping + FREE LensPen

HK$2,950.00 HK$2,250.00
(You save HK$700.00)
Shipping Weight:
0.20 KGS
Out of Stock. Contact us before ordering.
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 Clip filter for Fujifilm X series APS-C camera (see compatible list below)
  • STC high quality microfiber cleaning cloth


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

Why Clip Filter?

  • Significantly reduces colour shift that might occur at the peripheral areas of wide angle lens thanks to close distance between the filter and sensor
  • Specially designed clip-shaped structure allows the filter to be secured firmly inside the camera body with the lens attached. Therefore, the focal plane is fixed ensuring accurate and consistent focus.
  • The clip structure is made of A2 stainless steel which is virtually non-magnetic and suitable for low temperature use.
  • Coated with the use of the IBAD (Ion beam-assisted deposition) technology on Schott® B270 optical 1mm glass, working for higher durability and easily cleaning, and preventing aging variation in optical spectral characteristics due to temperature and humidity change
  • High-quality double-sided NANO Anti-smudge coating provides excellent performance on waterproof and grease-proof capability
  • Considering the different optical lens properties of all kinds of brands, it is normal for spherical and coma aberration to occur on part of the fisheye lens, super wide angle lens and wide angle lens.
  • 12 months original manufacturer warranty*

^Due to the differences in optical design among various lenses, when used with some fish-eye lens, ultra wide and wide angle lenses, the corners of the image might appear softer which is a normal optical phenomenon

Compatible Fuji-X APS-C bodies

  • X-H1
  • X-Pro 3
  • X-Pro 2
  • X-T4
  • X-T3
  • X-T2
  • X-T1
  • X-T30
  • X-T20
  • X-T100
  • X-E3
  • X-E2
  • X-E1
  • X-A5
  • X-A3

Compatible Fuji X-mount lenses

  • XF8-16mm F2.8 R LM WR
  • XF10-24mm F4 R OIS
  • XF16-55mm F2.8 R LM WR
  • XF18-55mm F2.8-4 R LM OIS
  • XF18-135mm F3.5-5.6 R LM OIS WR
  • XF50-140mm F2.8 R LM OIS WR
  • XF55-200mm F3.5-4.8 R LM OIS
  • XF100-400mm F4.5-5.6 R LM OIS WR
  • XC16-50mm F3.5-5.6 OIS
  • XF35mm F1.4 R
  • XF50mm F2 R WR
  • XF56mm F1.2 R
  • XF56mm F1.2 R APD
  • XF80mm F2.8 R LM OIS WR Macro
  • XF90mm F2 R LM WR
  • Zeiss Touit 1.8/32
  • Laowa 9mm F2.8

Incompatible Fuji X-mount lenses

  • XC15-45mm F3.5-5.6 OIS PZ
  • XF14mm F2.8 R
  • XF16mm F1.4 R WR
  • XF18mm F2 R
  • XF23mm F1.4 R
  • XF23mm F2 R WR
  • XF27mm F2.8
  • XF35mm F2 R WR
  • XF60mm F2.4 R Macro

Placing the light pollution filter closer to the sensor reduces color shift that may occur at the peripheral areas of the image if front screw-in lens filter is used. STC recommends using STC Astro Duo-Narrowband Clip Filter for Fuji X with lenses of focal length 20mm or longer, and avoiding directly taking pictures to strong artificial light which may cause slight flare on image.

Installation Procedure

Coming soon. 


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 always clean. If necessary, it's effortless to clean.


6 months warranty covering defects due to manufacturing and workmanship

*Extended to 12 months by registering on STC website.


Compatible camera

Please refer to the list above


0.5mm Schott® B270 Glass• - 304 (A2) Stainless Steel





Water drop contact angle

>110 degree

Multiple coating

Both-sided, total 160 layers




RoHS 2.0