The STC Astro Urban Sky SHO Filter accurately identifies the three crucial spectral lines, Ha, SII and OIII, in order to enhance the colours of nebulae and galaxies. The strict parfocal process is closely integrated with the German SCHOTT® B270 optical glass.

With a narrow bandpass of 7nm and a 95% penetration rate, SHO filters isolate specific spectrum produced by interstellar clouds. With the application of the new STC Astro Urban Sky SHO Filter, astronomical monochrome CMOS or CCD cameras can easily capture the colours of emission nebulae in urban skies.


  • With a narrow bandpass of 7nm and a 95% penetration rate.
  • Easy to use with ordinary digital or cool CCD cameras.
  • 0.5mm Schott B270 optical glass can absorb and dissipate heat to prevent fogging.
  • Super flat surface so you can capture clear images even when shooting at 8K and with 1200mm high-magnification telescope lens.
  • Uniq anti-reflective film stack design to reduce hallo and ghosting, less prone to fogging and rapid heat dissipation.
  • Double-sided anti-smudge nano-coating is hydrophobic stopping moisture and mold.
  • The packing rings are use for assisting filters to fixed in filter plates, it bundled with 31,36,50,50x50mm filter packs,can also buy a spare.
  • Covered by the world’s first global filter warranty and repair service. 

About This Product


Supported Size 1.25"
31mm frameless
36mm frameless

48mm Rear threaded

48mm Front and Rear threaded
50mm frameless
50x50 square
Threaded pitch 1.25" : 0.7
48mm : 0.75
Frame height(without threaded) 1.25":0.5cm
48mm Front and Rear threaded:0.4cm
48mm Rear threaded:0.15cm
Place of production TAIWAN