Sign Up Now !
You may also like
3pcs OPTOLONG 2" 25nm O-III Telescope Filter for Telescope 2'' Eyepiece Hot!!!
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
- 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).
Optolong 2" OIII 25nm Filter is made with Schott 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:
- Schott B260 substrate material from Germany, 2.0mm thick
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 deposition
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
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
- 3 x 2" OPTOLONG O-III 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 ?Sundays and holidays excepted. )after we receive the payment and after the eCheck is cleared.
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):
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.
- If you are satisfied with our service, please kindly leave us a positive feedback .
- Please leave feedback if you are satisfied. Please contact us for resolutions before leaving neutral or negative feedback, we strive to providing the greatest service and bringing the highest satisfaction to all of our customers.
- We strive to answer all emails as quickly as possible, but due to high email volume and time difference it may take time for us to reply. Thanks in advance for your patience!
- All items in our shop are covered by one year warranty.
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
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.
and replacement: Once the carrier has received your item, Please allow
up to 10 business days for returns to be processed.
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.
- If you want more items or make wholesale order, feel free to contact us. We will offer you a good discount!
Filed under: Eyepieces & Accessories