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Hot OPTOLONG 2" L-Pro Filter for Visual Observation 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 and 578nm).
- OPTOLONG 2" L-Pro Filter
- Sturdy Plastic Case
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payment via PAYPAL ONLY. We only ship to confirmed PAYPAL addresses.
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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 after we receive the payment and after the eCheck is cleared.
only ship to the confirmed address provided by PayPal. Please make sure
the Ship-To address you type during checkout is correct. We are not
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service. But sometimes international delivery is highly depended on the
Courier Company and local customs/duties. If you do not receive your
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Thank you for your understanding.
Custom fee (including VAT&GST):
duties, taxes and charges are not included in the item price or
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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
- 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.
- All items in our shop are covered by one year warranty.
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 S&H within 30 days of your purchase via parcel post.
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any exchange or refund, we need the product must be in its original
receipt, including the box, packaging and all the accessories.
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and replacement: Once the carrier has received your item, Please allow
up to 10 business days for returns to be processed.
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On 30-Jul-18 at 03:08:12 EDT, seller added the following information:
Filed under: Eyepieces & Accessories