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Home Filters Light Pollution Filters OVL 1.25 Inch Light Pollution Filter
This 1.25" contrast-enhancing anodized aluminium, optical glass filter is 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. Works well in telescopes of all apertures but is highly recommended for use on smaller telescopes where narrower band filters are less suitable and swallow up too much light. Supplied with storage case and simply screws into any 1.25" eyepiece or accessory with a standard filter thread.
Does the job Very well made for price, does the job, good delivery service. (17/05/2020) -
Very Useful Since I am observing the night sky from the City this is a useful tool to have (25/04/2020) Francesca -
OVL LIGHT POLLUTION FILTER Great service from these guys ! Item is very well made , in a case and should do a great job . Highly recommended for a better contrast in light polluted areas . An essential Bit of kit ! (04/04/2020) Phil D - West Midlands
Blue filter Jeff k . Im fairly new to astronomy . And bought this filter to aid better observations.just waiting fo a clear sky to tri it out . Looks good quality and arrived promptly !! (30/11/2019) Jeff knowles - Kent
Great service again. I haven't had a chance to use it yet. The filter looks good quality. The service from Harrisons is spot on,hence the 5 stars. (28/10/2018) H - Cambridge
Good Quality Useful and of good quality. (17/08/2018) Erica - Worcestershire
Well made product Extremely high quality for the price. (09/02/2018) Kevin Haworth - Liverpool
looks good quality lens not had chance to use this but it looks good quality lens and have been told by a friend that it works well. (10/11/2017) paul - stoke-on-trent