OVL 2" Light Pollution Filter

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Our Price: £33.99(Inc. 20% VAT)

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Part Number: 20199
Manufacturer: Optical Vision

Availability:

WE ARE TAKING ORDERS EVEN THOUGH STOCKS ARE STILL VERY SHORT AND WE ARE SEEING DELAYS ON A LOT OF PRODUCTS.

PLEASE EMAIL US AND WE WILL GET BACK TO YOU WITH AN EXPECTED DELIVERY DATE ON ANY OF THE PRODUCTS EVEN IF IT IS MARKED OUT OF STOCK.

We will come back to you as soon as we check with the warehouse (During working hours), or call us on 01483 756601

Email: enquiries@harpersphoto.co.uk

PLEASE NOTE THAT EXPECTED DELIVERY DATE DOES NOT MEAN THAT SOCK WILL BE AVAILABLE. IT MAY HAVE ALREADY SOLD OUT BEFORE ARRIVAL SO PRE-ORDERING IS ADVISED.

Light Pollution Filter 1.25”

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. Works well in telescopes of all apertures but is highly recommended for use on smaller telescopes up to 114mm diameter, where conventional filters swallow up too much light. Threaded to fit standard 2” astronomical eyepieces. Supplied with storage case.

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