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OPTOLONG 1.25"+2" H-Beta 25nm Telescope Filter Enhance Contrast of Nebulae for Visual Observation
Main Use and Performance:
- Use with a large aperture telescope under clear and dark viewing conditions with good seeing
- Suitable for viewing on the faint and elusive Horsehead Nebula and California Nebula
- 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
- WARNING: The filters of Optolong are not designed for
sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would
be BLIND if you fail to observe the warning.
- 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
- Ultra-thin filter cell minimize vignetting by maximize possible clear aperture (clear aperture is 45mm )
- Aerometal Material | Precise CNC Machining | Sand
Blasting Process | Black Anodized Finish | Extinction Treatment to
Prevent Reflection | Laser Engraving No Fading
- 1.25"&2" OPTOLONG H-Beta 25nm Filter
We accept payment via PAYPAL.Please make sure Ebay address 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(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.
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.
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Use with a large aperture telescope under clear and dark viewing conditions with good seeing
Suitable for viewing on the faint and elusive Horsehead Nebula and California Nebula
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.
WARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.
Filed under: Eyepieces & Accessories