About this product
Model: ae_fltr_lpr_2
Part Number: 2 Light Pollution Filter
Astro Essentials Light Pollution Filter 1.25" / 2"
This contrast-enhancing anodised aluminium filter with optical glass is designed to block wavelengths of light emitted by mercury-vapour lights 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 darker, and the contrast between object and sky is improved significantly. This contrast-enhancement effect is particularly apparent when viewing nebulae. Unlike stars, emission nebulae give off light in a very narrow range of wavelengths. The filter allows maximum transmission of the important wavelengths of H-alpha, H-beta and doubly ionised oxygen – the ones most commonly emitted by nebulae.
Galaxies and star clusters are also enhanced but to a lesser degree. It also enhances reddish planetary detail.
Works well in telescopes of all apertures.
Available in two sizes, threaded to fit either standard 1.25” or 2” astronomical eyepieces.
Customer reviews
FAQ
Please fill in the form below to ask a question.