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1.25" Astro Urban Sky L Filter

STC Astro Urban Sky LRGB screw circular filters are designed for shooting astronomical deep-sky objects in areas with heavy light pollution such as urban areas. Blocks daylight mercury lamps (Hg), neon lamps and a large number of orange nano lamps (Na) in the blue B and green G channels, overlapping OIII oxygen atoms at 495.9nm and 500.7nm spectral positions to increase the blue-green signal, red R The channel covers the spectrum range of H-alpha (656.3nm) hydrogen atoms, NII (654.8, 658.3) nitrogen ions and Sulfur II (672.4nm) sulfide ions, and controls the 1:1:1 balance colour separation with the GB green and blue ratio. Three kinds of colour filters can adjust the exposure according to the spectrum of the celestial body's emission and refraction, or add the STC urban deep sky SHO filter to highlight the characteristics of the star cluster and develop its own unique bright colours of the celestial body.

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£ 76.99 
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Excellence in Product Design

Each and every product is put through a meticulous R&D program to give you the latest technology. Then each and every filter is hand built, serial numbered and packaged safely ready to be sent out. Use STC products to enhance your photography and videography.

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Fed up of the additional filter cost when you buy a new size lens? Our clip filters not only protect your sensor, offer no degradation, but work with all your lenses!

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We understand you want the best. You spend as much money as you can on your equipment. That's why all our products are manufactured from the latest materials and coating technology.

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