{"product_id":"optolong-l-pro-deep-sky-light-pollution-filter-2","title":"Optolong L-Pro Deep Sky Light Pollution Filter - 2\"","description":"The L-Pro Filter is the best choice for light pollution suppression and allows astrophotos to be taken of broadband emission objects such as galaxies, reflection nebulae and globular star clusters.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eThe relentless spread or urbanization and its associated light pollution have become a big problem for all amateur astro photographers around the world. One solution is to purchase a Mono camera but this can be expensive and might also require the purchase of several types of narrowband filters and a filter wheel.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eL-Pro is a multi-bandpass filter which offers much better color balance by maximizing the transmission band. The balanced transmission allows astrophotos to be taken with minimal color cast to broadband emission objects such as galaxies, reflection nebulae and globular star clusters. L-Pro remains the best choice for viewing or photographing broadband targets in light polluted areas.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eL-Pro (L-Professional) filter is designed to improve the visibility of various deepsky objects by selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lights such as mercury vapor lamps, both high \u0026amp; low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). Together with the highly transparent main emission lines at OIII (496nm and 500nm), H-beta (486nm), NII (654nm and 658nm), H-alpha (656nm) as well as SII (672nm), the filter is suitable for enhancing the contrast and details for both visual and photograghic purpose at sub-rural areas with heavy light pollution.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eL-Pro has a multiple anti-reflective coating on the optical substrate and uses a precision coating based on ion deposition coating technology. This ensures durability and scratch resistance as well as stability on the CWL (central wavelength), which is not affected by temperature changes.\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cem\u003eIMPORTANT WARNING: These nebula filters are NOT designed for observation of the Sun. Do not use this filter to look at the Sun as serious eye damage, blindness as well as damage to equipment may result.\u003c\/em\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\n\u003cul\u003e\n\u003cli\u003eProfessional visual and photographic filter for astronomy\u003c\/li\u003e\n\u003cli\u003eImproves deep sky nebula constellation photography\u003c\/li\u003e\n\u003cli\u003eBest choice for broadband light pollution suppression\u003c\/li\u003e\n\u003cli\u003eFilter diameter: 2 inch\u003c\/li\u003e\n\u003cli\u003eConnecting thread: M28.5 x 0.6mm (Eyepiece thread 1.25 inch)\u003c\/li\u003e\n\u003cli\u003eSelected optical glass material\u003c\/li\u003e\n\u003cli\u003eSpectrum: 380-750nm\u003c\/li\u003e\n\u003cli\u003eSurface Quality: 60\/40 (Refer to MIL-O-13830)\u003c\/li\u003e\n\u003cli\u003eFine-optically polished glass to ensure accurate 1\/4 wavefront and highest parallelism over the both surfaces\u003c\/li\u003e\n\u003cli\u003eHigh transmission at major nebula emission lines (i.e. H-alpha 656nm, OIII 496nm\u0026amp;500nm, SII 672nm and H-beta 486nm)\u003c\/li\u003e\n\u003cli\u003ePrecision off-band blocking, specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nm and 578nm)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cem\u003eWhats included:\u003c\/em\u003e\u003cbr data-mce-fragment=\"1\"\u003e\n\u003col\u003e\n\u003cli\u003eL-Pro filter (2\")\u003c\/li\u003e\n\u003cli\u003eDust protection box\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Optolong","offers":[{"title":"Default Title","offer_id":40684948291779,"sku":"0310150","price":236.7,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/1924\/6275\/products\/OptolongL-ProFilter2_2.jpg?v=1631730201","url":"https:\/\/www.horizonastronomy.ie\/en-pt\/products\/optolong-l-pro-deep-sky-light-pollution-filter-2","provider":"Horizon Astronomy • Telescope Center","version":"1.0","type":"link"}