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Navigating Tariffs: Due to the current volatile tariff environment and associated logistics challenges, O'Telescope is unable to fulfill shipments to the United States. Orders submitted with a U.S. shipping address will be refunded, with the payment gateway transaction fee deducted. This restriction does not affect BackyardEOS or BackyardNIKON, which remain available as digital downloads.
Inventory closeout sale, everything must go. Up to 35% off. Some conditions apply.
We are closing our inventory side of the business and focusing solely on software - going back to our roots so to speak. No store coupons required, all prices have been marked down. First come, first served, until quantities last. We are no longer placing orders with manufacturers. Absolutely no rain checks. We reserve the right to cancel and refund orders at our sole discretion. We do our best to maintain our inventory accurate, but mistakes do happen, if you purchase an item that is no longer in stock, you will be refunded. The sale does not apply to some higher-end items such as 10Micron. Prices subject to change without notice. ALL SALES ARE FINAL.
Occasionally, we find a box under a box under a box in the back of the warehouse with hidden treasures, and when we do, we add these items on the site, so even though you may not find what you're looking for today, it could automagically appear next week.
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Light Pollution Filters
9 products
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![Optolong 1.25'' CLS light-pollution filter [OPTO-CLS-125]](https://www.otelescope.com/uploads/store-OPTO-CLS-125.jpg)
Optolong 1.25'' CLS light-pollution filter [OPTO-CLS-125]
$68.38 CAD$85.47 CAD2 in stock On saleBack Order / Waiting ListOptolong: The CLS (City Light Suppression) broadband filter is designed to improve the visibility of various deep sky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high & 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 in main nebula 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 area.
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![Optolong 2'' CLS light-pollution filter [OPTO-CLS-2]](https://www.otelescope.com/uploads/store-OPTO-CLS-2.jpg)
Optolong 2'' CLS light-pollution filter [OPTO-CLS-2]
$103.49 CAD$129.36 CAD2 in stock On saleBack Order / Waiting ListOptolong: The CLS (City Light Suppression) broadband filter is designed to improve the visibility of various deep sky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high & 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 in main nebula 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 area.[/extract]
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![Optolong 1.25'' CLS-CCD light-pollution filter [OPTO-CLS-CCD-125]](https://www.otelescope.com/uploads/store-OPTO-CLS-CCD-125.jpg)
Optolong 1.25'' CLS-CCD light-pollution filter [OPTO-CLS-CCD-125]
$116.36 CAD$145.45 CAD2 in stock On saleBack Order / Waiting ListOptolong: The CLS-CCD broadband filter is designed to improve the visibility of various deep sky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high & 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 in main nebula 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 photograghic purpose at light pollution area.
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![Optolong 2'' CLS-CCD light-pollution filter [OPTO-CLS-CCD-2]](https://www.otelescope.com/uploads/store-OPTO-CLS-CCD-2.jpg)
Optolong 2'' CLS-CCD light-pollution filter [OPTO-CLS-CCD-2]
$190.10 CAD$237.62 CAD3 in stock On saleBack Order / Waiting ListOptolong: The CLS-CCD broadband filter is designed to improve the visibility of various deep sky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high & 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 in main nebula 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 photograghic purpose at light pollution area.[/extract]
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![Optolong 1.25'' L-eNhance light-pollution filter [OPTO-L-ENHANCE-125]](https://www.otelescope.com/uploads/monthly_2019_09/opto-lenhance2asdasd.jpg.487cb3bbec1c0e2d2ab3c6d2dab31612.jpg)
Optolong 1.25'' L-eNhance light-pollution filter [OPTO-L-ENHANCE-125]
$213.50 CAD$266.88 CAD10 in stock On saleBack Order / Waiting ListOptolong: About L-eNhance Filter
The relentless spread of urbanization and its associated light pollution have become a growing problem for all amateurs and astro photographers. The current solutions to the problem can be expensive and might include the purchase of a monochrome camera, several types of narrowband filters and a filter wheel.L-eNhance provides an economical and practical solution for amateurs. It is a dual-band pass filter which has been designed for DSLR (digital SLR), color CMOS and CCD cameras. The convenience and cost effectiveness of this filter allows amateurs to image a rich selection of astronomical images, even in bright, heavily light-polluted areas.
Optolong believes the design of our L-eNhance filter is a technical innovation among filters. It effectively isolates the H-Alpha, H-Beta, and Oxygen III nebula emission lines and achieves a maximum transmission of up to 90%. The performance of this filter delivers images that superbly control the impact from light polluted skies.
Hydrogen is the largest, the most primitive, the simplest, and the oldest element in the universe. Scientists
consider that Hydrogen amounts to more than 90% of visible substance in space. Our sun is 5 billion years old,
but so far hydrogen is still the key matter of nuclear fusion. While the sulfur element does not have much
scientific significance, so keeping H and O is meaning for exploration of life.
Therefore, we highlight H-a, H-b, O3 and O2, and reduce the signal of sulfurL-eNhance Filter Spectrum Curve
According to the characteristics of celestial body emission lines and feature of light pollution span of spectrum, Optolong specially designed and optimized dual-band L-eNhance filter in order to retain the prominent color of nebula RGB while blocking out most of light pollution.Package Details
Silver cardboad box
Plastic PP box
Imported high pressure EVA case liningWarm Prompt
About Color: Light, computer display and other reasons, pictures and objects may slightly chromatic aberratio (color fifference), please refer to the material itemAbout Coating: Interferential filter to change surface color depending upon light and movement. Please in kind prevail.
About Product Object: All of specifications change in order to improve product quality. We ask your understand if any update informations publish delay.
About Product Overview: Please note that this series of filter as same as specifications, processing technic, test methods. It is only size difference.
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![Optolong 2'' L-eNhance light-pollution filter [OPTO-L-ENHANCE-2]](https://www.otelescope.com/uploads/monthly_2019_09/opto-lenhance2asdasd.jpg.754157697c8b686064958b77a97061ad.jpg)
Optolong 2'' L-eNhance light-pollution filter [OPTO-L-ENHANCE-2]
$272.02 CAD$340.03 CAD8 in stock On saleBack Order / Waiting ListOptolong: About L-eNhance Filter
The relentless spread of urbanization and its associated light pollution have become a growing problem for all amateurs and astro photographers. The current solutions to the problem can be expensive and might include the purchase of a monochrome camera, several types of narrowband filters and a filter wheel.L-eNhance provides an economical and practical solution for amateurs. It is a dual-band pass filter which has been designed for DSLR (digital SLR), color CMOS and CCD cameras. The convenience and cost effectiveness of this filter allows amateurs to image a rich selection of astronomical images, even in bright, heavily light-polluted areas.
Optolong believes the design of our L-eNhance filter is a technical innovation among filters. It effectively isolates the H-Alpha, H-Beta, and Oxygen III nebula emission lines and achieves a maximum transmission of up to 90%. The performance of this filter delivers images that superbly control the impact from light polluted skies.
Hydrogen is the largest, the most primitive, the simplest, and the oldest element in the universe. Scientists
consider that Hydrogen amounts to more than 90% of visible substance in space. Our sun is 5 billion years old,
but so far hydrogen is still the key matter of nuclear fusion. While the sulfur element does not have much
scientific significance, so keeping H and O is meaning for exploration of life.
Therefore, we highlight H-a, H-b, O3 and O2, and reduce the signal of sulfurL-eNhance Filter Spectrum Curve
According to the characteristics of celestial body emission lines and feature of light pollution span of spectrum, Optolong specially designed and optimized dual-band L-eNhance filter in order to retain the prominent color of nebula RGB while blocking out most of light pollution.Package Details
Silver cardboad box
Plastic PP box
Imported high pressure EVA case liningWarm Prompt
About Color: Light, computer display and other reasons, pictures and objects may slightly chromatic aberratio (color fifference), please refer to the material itemAbout Coating: Interferential filter to change surface color depending upon light and movement. Please in kind prevail.
About Product Object: All of specifications change in order to improve product quality. We ask your understand if any update informations publish delay.
About Product Overview: Please note that this series of filter as same as specifications, processing technic, test methods. It is only size difference.
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![Optolong 2'' L-eXtreme Dual Narrowband Filter [OPTO-L-EXTREME-2]](https://www.otelescope.com/uploads/monthly_2020_10/dual-band-filter-from-optolong-no-case-l-extreme_1.jpg.1507fe92e72a242eb577fe813af68ba8.jpg)
Optolong 2'' L-eXtreme Dual Narrowband Filter [OPTO-L-EXTREME-2]
$365.66 CAD$457.07 CADOn saleThe Optolong 2" L-eXtreme Dual Band filter is a 7nm bandpass filter that isolates the H-Alpha and Oxygen III emission lines to maximize the signal-to-noise ratio between nebulae. When compared to the Optolong L-eNhance tri-band filter, the dual band only emits the Ha and OIII emission lines rather than the L-eNhance filters transmission of Hb, Ha, and OIII. Optolong has ensured that the L-eXtreme filters do not transmit between H-beta and OIII lines, as there are no nebula lines there. Limiting the transmission this way means that light pollution is blocked so nebula signals are boosted and the background of the sky becomes darker for better contrast during imaging. For those who live in areas with higher levels of light pollution or for those who would like to image during times where the Moon is bright, this threaded L-eXtreme filter is an excellent tool for their astrophotography toolbox!
When it comes to quality control Optlong ensures that each filter is examined by Spectrophotometer and Laser Interferometer for spectrum characteristics and surface accuracy respectively. During the manufacturing process, high-precision grinding and polishing is used to ensure that the substrate parallelism is greater than 30" and the surface accuracy is better than λ/4. Electron-beam gun evaporation and Ion-assisted deposition (IAD) coating is applied to provide durability and resistance to scratching. IAD increases film firmness, consolidates membrane compactness, and changes vacuum coating material characteristics. This type of manufacturing technology also provides stability on the central wavelength so there is no deviation during temperature changes.
L-eXtreme Dual Band Filter SpecificationsSubstrate: B270
Filter Size: 2"
Thickness: 1.85mm
FWHM: OIII 7nm+Ha 7nm
Blocking range: 300-1000nm
Blocking depth: light pollution line blocking >99%
Surface quality: 60/40
Transmitted Wavefront RMS: λ/4
Parallelism: 30sOut of Stock -
![Optolong 1.25'' L-Pro light-pollution filter [OPTO-L-PRO-125]](https://www.otelescope.com/uploads/store-OPTO-L-PRO-125.jpg)
Optolong 1.25'' L-Pro light-pollution filter [OPTO-L-PRO-125]
$178.39 CAD$222.99 CAD4 in stock On saleBack Order / Waiting ListOptolong: The L-Pro (L-Professional) filter is designed to improve the visibility of various deep sky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high & 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 in main nebula 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 area with heavy light pollution.
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![Optolong 2'' L-Pro light-pollution filter [OPTO-L-PRO-2]](https://www.otelescope.com/uploads/store-OPTO-L-PRO-2.jpg)
Optolong 2'' L-Pro light-pollution filter [OPTO-L-PRO-2]
$236.91 CAD$296.14 CAD8 in stock On saleBack Order / Waiting ListOptolong: The L-Pro (L-Professional) filter is designed to improve the visibility of various deep sky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high & 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 in main nebula 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 area with heavy light pollution.
