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New Optolong 2" Ultra High Contrast UHC Nebula Filter for Cuts Light Pollution
OPTOLONG UHC Filter
The Optolong UHC (Ultra High Contrast) broadband filter is designed to improve the visibility of various deep sky objects. It does this by: Selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lighting (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)). Being highly transparent to the main nebula emission lines at OIII (496nm and 500nm), H-beta (486nm), NII (654nm and 658nm), H-alpha (656nm) as well as SII (672nm).
- 2" astronomy filter with standard M48.5x0.75 male filter thread (no female thread, so it cannot be stacked with other filters).
- Ultra-thin filter cell to minimize vignetting; clear optical aperture of 45mm.
- Precision CNC-machined metal filter cell with sand blasted black anodized finish, anti-reflection treatment, and laser engraving.
- High quality protective plastic storage case
Main Uses and Performance
- Suitable for enhancing the contrast and details for both visual and photographic purpose at urban and suburban areas with heavy light pollution.
- Suitable for color CCD cameras and unmodified DSLRs.
- UHC has a narrower passband and thus provides higher contrast than a CLS (City Light Pollution / Light Pollution Reduction) filter. Thus it is more suitable for urban environments where you suffer from severe light pollution.
- UHC has a substantial red passband and offer superb views of objects like the Orion Nebula (M42).
Spectral Curve Transmission Characteristics
- 95% transmission of main nebula emission lines:
- H-beta 486.1nm, OIII 495.9nm and 500.7nm, H-alpha 656.3nm, and SII 672nm.
- 0.1% transmission of major transmission lines of artificial light pollution:
- Hg (Mercury) at 435.8nm, 546.1nm, 577nm, and 578.1nm.
- Na (Sodium) at 598nm, 589.6nm, 615.4nm, and 616.1nm.
- Both surfaces are fine optically polished, accurate to 1/4 wavelength or better, and parallel to within 30 seconds or arc.
- 2mm thick B270 optical glass substrate material.
- Very high surface quality of 60/40 or better (US Military Spec MIL-O-13830).
Optical Coating Specifications
- Multi-layer anti-reflection coated.
- 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) so that there is no deviation due to temperature changes during use.
- Precise and homogeneous coatings ensure high values of desired passband and blocking of unwanted offband.
- Every single filter is tested and passed by Optolong before shipping to dealers.
- 1 x 2" OPTOLONG UHC Telescope Filter
- We accept payment via PAYPAL ONLY. We only ship to confirmed PAYPAL addresses. Please make sure payment address in PayPal is correct.
- All major credit cards are accepted through our secure payment processor PayPal.
- 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.
- We 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 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.
- 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:Chinese 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
- 2.You can pay extra shipping cost to get express delivery, such as EMS, DHL or UPS. It just takes 3-7 business days to receive order, please contact us if necessary.
- All items in our shop are covered by one year warranty.
- 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 S&H within 30 days of your purchase via parcel post.
- Please contact us before you return the item, we will offer you the right return address
- For any exchange or refund, we need the product must be in its original receipt, including the box, packaging and all the accessories.
- Buyers are responsible for the returning shipping cost. Shipping and handling charges are not refundable.
- Refund and replacement: Once the carrier has received your item, Please allow up to 10 business days for returns to be processed.
- If you cannot return it, you can sell it, too!! Been holding on to something past its return date? You can sell it online on eBay! Find its exact match on eBay and click the "Sell an item" button. It's easy.
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- Our working time: 8:00am-18:00pm (Beijing Time). Because of time-difference, we cannot give you a quick reply sometimes. Please wait for some more time.
- If you want more items or make wholesale order, feel free to contact us. We will offer you a good discount!
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