STC city deep space SHO Astro Urban Sky circular filters accurately locates the three spectral lines, strict parfocal (Parfocal) process with a bandwidth of 7nm narrow frequency tightly combined with German SCHOTT® B270 optical glass to achieve 95% transmittance, with cooling The CCD monochrome astronomical camera can easily obtain the correct colour of SHO. The thickness of 0.5mm glass and the anti-fouling nano coating contribute to the advantages of less fogging and fast heat dissipation. The shortening of the photon path through the filter also avoids halo, ghosting, overlap, flare and other conditions, and greatly improves the degree of focus shift due to thickness. The glass surface polishing process, which is longer than ordinary filters, is clear, sharp, and not blurred even when recording 8K images and using 1200mm high-power telephoto lenses.

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