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SVBONY SV115 18nm 2" O-III Filter Narrowband Cuts Light Pollution Filter for Astronomy Telescope
SVBONY SV115 18nm 2" O-III Filter Narrowband Cuts Light Pollution Filter for Astronomy Telescope Description Narrowband OIII filter is designed for nebula observation allowing 18nm bandwidth of light centered on a wavelength of 500nm through, which corresponds to OIII emission lines, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).Features:
- Filter substrate is fine-optically polished to 1/4 wave and <30 parallelism over both surfaces.
- Suitable for visual observation on most emission nebulae, planetary nebulae and supernova remnants.
- Suitable for viewing on bright nebulae like M42 Orion Nebula in heavy light pollution.
- Use with a large aperture telescope under clear and dark viewing conditions with good seeing.
- Narrowband filter do not eliminate the effects of light pollution or increase the object's brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.
- Thin metal cells have a clear aperture of 45mm for 2" filters
- Each filter comes with a plastic case with high pressure EVA case lining
- Blocking area: 400-700nm
- Transmittance: 90% at 495.9nm and 500.7nm
- FWHM: 18±2nm
- Thickness: 1.85mm
- Surface quality: 60/40 (Refer to MIL-O-13830)
- Diameter: 2 inch
- Weight: 31g
WARNING: The filters are not designed for sun observation. DO NOT LOOK AT THE SUN WITH this FILTER. You would be BLIND if you fail to observe the warning. Package Includes
- 1 xSV115 O-III 2" filter
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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 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.
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