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OPTOLONG 2" 25nm O-III Telescope Filter for Telescope 2''Eyepiece+Track Hot sale
This Optolong OIII filter has a FWHM of 25nm, making it
suitable for visual observations of most emission nebulae, planetary
nebulae, and supernova remnants with a telescope of at least 6-8". The
OIII broadband filter increases the contrast between the background sky
and these objects, so it will also help with observations of bright
nebulae, such as the Great Orion Nebula, M42, from light polluted skies.
Fainter objects require nights of good seeing and reasonably dark skies
for best filter performance. This filter just might allow you to see
objects that you'd otherwise miss!
The Optolong Oxygen III Broadband Filter transmits a
25nm bandwidth of light that is centered at 500nm and precision blocks
other transmissions, including wavelengths of light that are responsible
for light pollution (both artificial and natural).
The Optolong 2" OIII 25nm Filter is made with glass that has been multi-coated with an ion-assisted deposition
technology to ensure scratch resistance and stability on the central
wavelength, or CWL. The filter cell is made of lightweight, strong metal
and is CNC machined, sand-blasted, black anodized, and then laser
engraved. The result is a super thin filter cell that will produce a
clear aperture of 26mm.
Quality Filter Materials:
- B260 substrate material from Germany, 2.0mm thick
- CNC machined and black anodized aero-metal filter
cell that is ultra-thin to provide largest clear aperture;
Laser-engraved to prevent fading
- Multiple layers of anti-reflection non-cementing
coatings applied via electron-beam gun evaporation with Ion-assisted
Optolong Filter Manufacturing Processes and Parameters:
- Filter substrate is fine-optically polished to 1/4 wave and <30 parallelism over both surfaces
- Surface quality, according to MIL-O-13830, is 60/40
- 90% transmission at 495.9nm and 500.7nm
- 0.1% transmission Hg at 435nm and 578nm
- 0.1% transmission Na at 589nm
- High value transmission of pass-band and optical
density of off-band is assured through Optolong's planetary rotation
system, a homogenous and precise coating procedure
- Thin metal cells have a clear aperture of 26mm for 2" filters
- Each filter comes with a plastic case with high pressure EVA case lining
- 1 x 2" OPTOLONG O-III Telescope Filter
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.
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
- 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 accept payment via PAYPAL. 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.
- Our goal is to make sure you are a happy customer and pleasant shopping with us.
- If you are satisfied with the purchase and our total service, your comment is very important in our business success. Please take a minute to leave us a positive feedback with an overall Detailed Selling Rating (DSR) of 5.
- If you are not satisfied with your purchase in any way, Please give us the opportunity to resolve any problem. We understand the concerns and frustrations you might have, and will try our best to resolve the issues.
- 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.
- Do not hesitate to contact us anytime before and after your purchase through the clicking "ASK A QUESTION' and we are committed to your 100% customer satisfaction or you can contact us
- 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.
On Feb-28-19 at 18:10:13 PST, seller added the following information:
Filed under: Eyepieces & Accessories