Sky-Watcher 2" Light Pollution Filter

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  • Regular price £29.00
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Product Code: OVL20199


These contrast-enhancing anodized aluminium, optical glass filters are 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. These filters allow maximum transmission of the important wavelengths of H-alpha, H-beta and doubly ionized oxygen – the ones most commonly emitted by nebulae.

Views of galaxies and star clusters are also enhanced, but to a lesser degree. Also improves contrast on reddish planetary detail.

Threaded to fit standard 2” astronomical eyepieces. Supplied with storage case.