Optical Vision 2 Inch Light Pollution Filter

The Sky Watcher 2 Inch Light Pollution Filter is a contrast enhancing anodised aluminium, optical glass filter designed to block out the wavelengths of light emitted by mercury vapour light and other common causes of light pollution, whilst providing higher transmission at critical hydrogen alpha and hydrogen beta lines than competing filters. Bright, light polluted skies appear much darker, and the contrast between object and sky is improved significantly. This contrast enhancement effect is particularly apparent on nebulae. Unlike stars, emission nebulae give off light in a very narrow range of wavelengths....Read More...»»