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SVBNOY H-Alpha 7nm 2"Filter Narrowband Astro Deep Sky Photographic CCD Filter
Because H-Alpha is 656nm mainly through the
high permeability of the spectrum, and 656nm spectrum of the color
presented by the red-based, 300-1100nm cut-off depth to get the details
of the launch nebula richer. Extremely narrow bandwidth allows only the
656nm band to pass through the filter, can effectively cut off the
artificial light Na lamp and Hg lamp interference to make the
transmission line through, so as to improve the nebula contrast. With
CCD is better choice for deep sky photography and wide-field
- Optical high-precision double-sided polishing to ensure
that the parallelism is higher than 30 "and high flatness 1 / 4λ, to
ensure that does not affect the image quality of the image.
- Precision double-sided optical coating, non-two-piece glue, effectively improve the transmittance and cut-off depth.
- Electron Gun Evaporation Technology (E-Beam Gun)
- Ion source assisted coating technology (IAD), to
improve the density of the film to ensure that the filter wavelength to
minimize the impact of temperature caused by the temperature drift.
- High uniformity planetary wheel coating fixture to improve the uniformity of the filter wavelength
- Optical equipment professional fine sandblasting and anode treatment, the box to do extinction treatment to prevent reflection
- Laser engraving LOGO-never fade, fade
- Metal frame, superior aviation aluminum
- High cutoff is effective has been the light damage and other stray light interference
- Using Germany imported glass, using double-sided polishing processing
- For the emission line 656nm transmittance of 85% or more
- The narrow-band filter, even in areas where light
pollution is heavy, and the full moon (the moon's largest and brightest)
is the same, very narrow bandwidth, which reduces the interference of
the external environment, but the haze and cloudy The weather is not
- Precision CNC integrated molding
- Multi-layers anti-reflection coating
- Frame with high-quality aluminum alloy material, anodized extinction treatment
- Thread: M48*0.75
- Lined with double-layer EVA damping cotton
- Carton PP environmentally friendly materials, simple and beautiful
- SVBNOY 2" H-Alpha 7nm Filter
- PP Material Plastic Box
Processing time:as the item description:
- We will prepare the shipment in 48-72 hours ?Working days?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.
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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
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Because H-Alpha is 656nm mainly through the high permeability of the spectrum, and 656nm spectrum of the color presented by the red-based, 300-1100nm cut-off depth to get the details of the launch nebula richer. Extremely narrow bandwidth allows only the 656nm band to pass through the filter, can effectively cut off the artificial light Na lamp and Hg lamp interference to make the transmission line through, so as to improve the nebula contrast. With CCD is better choice for deep sky photography and wide-field astrophotography.On May-23-19 at 03:32:32 PDT, seller added the following information:
Filed under: Eyepieces & Accessories