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OPTOLONG 1.25" L-Pro Filter Suitable for visual observation and astrophotography Best Choice for Light Pollution Suppression
The L-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 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
photographic purpose at sub-rural area with heavy light pollution.
Main Use and Performance:
- Ultra-thin filter cell minimize vignetting by maximize possible clear aperture
- Aerometal Material | Precise CNC Machining | Sand
Blasting Process | Black Anodized Finish | Extinction Treatment to
Prevent Reflection | Laser Engraving No Fading
- Multi-layers anti-reflection coating
- Non-cementing optical substrate coating
- Electron-beam gun evaporation with Ion-assisted
deposition coating technology for durability and resistance to
scratching, as well as stability on CWL (central wavelength) no
deviation affected by temperature change.
- Planetary rotation system offers precision and
homogeneity of coatings ensuring high value on transmission of pass-band
and Optical density of off-band.
- Schott substrate material
- Thickness 2.0 mm
- Surface Quality: 60/40 (Refer to MIL-O-13830)
- Fine-optically polished to ensure accurate 1/4 wavefront and < 30 seconds parallelism over the both surfaces
- High transmission at major nebula emission lines (i.e. H-alpha 656nm, OIII 496nm&500nm, SII 672nm and H-beta 486nm).
- Precision off-band blocking, specifically the major
emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nm
- OPTOLONG 1.25" L-Pro Filter
- Sturdy Plastic Case
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Payment must be received within 7 business days of auction closing.
Processing time:as the item description.
We will prepare the shipment in 48-72 hours(Sundays and holidays excepted. )after we receive the payment and after the eCheck is cleared.
Please make sure the Ship-To address you type during checkout is correct. We are not responsible for any wrong or undeliverable addresses.
We strive our best to provide you the most reliable, affordable way of shipping service. But sometimes international delivery is highly depended on the Courier Company and local customs/duties. If you do not receive your item on time, please contact us immediately for further assistance. Thank you for your understanding.
Custom fee (including VAT&GST):
Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer's responsibility. Please check with your country's customs office before bidding. We will try our best to help customer do customs clearance.
A:Overseas Warehouse Local Dispatch
From US Local Dispatch: USA: 2-6 business days , other countries: 5-14 business days.
From UK Local Dispatch: UK: 1-5 business days , other countries: 3-8 business days.
From DE Local Dispatch: Deutschland: 1-3 business days , other countries: 2-5 business days.
From AU Local Dispatch: AU:2-6 business days. B: China Domestic Dispatch
CountryDelivery TimeWorking Days(not including holiday)5-78-1112-1415-1920-22>22Working Days+Saturday+Sunday5-910-1516-2021-2526-30>31United KingdomRate(item arrived)9.9%63.2%19.1%3.4%4.4%RefundAustraliaRate(item arrived)21.4%50%14.3%7.2%7.1%RefundFranceRate(item arrived)10.5%28.6%43.8%10.1%7%RefundGermanyRate(item arrived)11.1%22.2%30.3%20.9%15.5%RefundCanadaRate(item arrived)0%47.1%31.4%17.6%3.9%RefundSpainRate(item arrived)3.5%25%47.9%12.9%10.7%Refund Note:You can pay extra shipping cost to get express delivery, such as EMS, DHL or UPS. It just takes about 5-10 business days to receive order, please contact us if necessary.
We stand behind every product we sell. If you're not pleased with your purchase, we'll be happy to make an exchange or refund the product price less Shipping &handling within 30 days of your purchase via parcel post.
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Buyers are responsible for the returning shipping cost. Shipping and handling charges are not refundable.
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The L-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 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 photographic purpose at sub-rural area with heavy light pollution.On Jul-11-19 at 18:23:24 PDT, seller added the following information:
Filed under: Eyepieces & Accessories