The Astronomik CLS blocks the light of the spectral lines of mercury and sodium-vapor lamps and lets the largest part of the visible light and H-alpha emissions pass.
These contrast-enhancing filters are designed to block out the wavelengths of light emitted by mercury-vapour light and other common causes of light pollution.
2 Rosemary Lane, Sutton nr. Ely, Cambridgeshire, CB6 2NZ Telephone Hours: Monday to Friday - 10:00am-4:00pm Our showroom is currently closed for visits until further notice. We are closed on Bank Holidays. Online orders are despatched as normal.
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