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OPTOLONG 2” UHC Filter for Telescope Observation of Deep Sky Objects Astronomy Monocular Binoculars Telescope LD1001B

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OPTOLONG 2″ Filter Ultra High Contrast UHC for Telescope Monocular Astronomy Nebula Filter for Cuts Light Pollution Hot

OPTOLONG UHC Filter

The Optolong UHC (Ultra High Contrast) broadband filter is designed to improve the visibility of various deep sky objects. It does this by: Selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lighting (including mercury vapor lamps, both high & low pressure sodium vapor lights, and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow)). Being highly transparent to the main nebula emission lines at OIII (496nm and 500nm), H-beta (486nm), NII (654nm and 658nm), H-alpha (656nm) as well as SII (672nm).

Main Feature

  1. 2″ astronomy filter with standard M48.5×0.75 male filter thread (no female thread, so it cannot be stacked with other filters).

  2. Ultra-thin filter cell to minimize vignetting; clear optical aperture of 45mm.

  3. Precision CNC-machined metal filter cell with sand blasted black anodized finish, anti-reflection treatment, and laser engraving.

  4. High quality protective plastic storage case

Main Uses and Performance

  1. Suitable for enhancing the contrast and details for both visual and photographic purpose at urban and suburban areas with heavy light pollution.

  2. Suitable for color CCD cameras and unmodified DSLRs.

  3. UHC has a narrower passband and thus provides higher contrast than a CLS (City Light Pollution / Light Pollution Reduction) filter. Thus it is more suitable for urban environments where you suffer from severe light pollution.

  4. UHC has a substantial red passband and offer superb views of objects like the Orion Nebula (M42).

Spectral Curve Transmission Characteristics

  1. 95% transmission of main nebula emission lines:

  2. H-beta 486.1nm, OIII 495.9nm and 500.7nm, H-alpha 656.3nm, and SII 672nm.

  3. 0.1% transmission of major transmission lines of artificial light pollution:

  4. Hg (Mercury) at 435.8nm, 546.1nm, 577nm, and 578.1nm.

  5. Na (Sodium) at 598nm, 589.6nm, 615.4nm, and 616.1nm.

Technical Specifications

  1. Both surfaces are fine optically polished, accurate to 1/4 wavelength or better, and parallel to within 30 seconds or arc.

  2. 2mm thick Schott B270 optical glass substrate material.

  3. Very high surface quality of 60/40 or better (US Military Spec MIL-O-13830).

Optical Coating Specifications

  1. Multi-layer anti-reflection coated.

  2. Non-cementing optical substrate coating.

  3. Electron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength) so that there is no deviation due to temperature changes during use.

  4. Precise and homogeneous coatings ensure high values of desired passband and blocking of unwanted offband.

Parcel:

  • 2″ OPTOLONG UHC Telescope Filter

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Return

1.We only Accept Return within 30 days .

2.We will pay for the return postage only if the return is a result of our error

3.We use eparcel return for most of our return parcels , the customer will receive a eparcel return label in your mail

4.Just need to print out the label and bring the parcel together to your local post office , the parcel will be sent back on our cost.

5.The customer need to pay for the return postage if it is a no-seller mistake return , For example change of mind on your purchase

6.We will need to deduct the cost on us and refund the balance to you once return parcel is received .

7.We reserve the right to refuse any return from objective reason.

Contact us

Customer can contact us on aliexpress message.

We will reply you within same day , from mon-fri

The communication will be delayed during weekend or public holiday.

SHIPPING AND DELIVERY

We are proud to offer international shipping services that currently operate in over 200 countries and islands world wide. Nothing means more to us than bringing our customers great value and service. We will continue to grow to meet the needs of all our customers, delivering a service beyond all expectation anywhere in the world.

How do you ship packages?

Packages from our warehouse in China will be shipped by ePacket or EMS depending on the weight and size of the product. Packages shipped from our US warehouse are shipped through USPS.

Do you ship worldwide?

Yes. We provide free shipping to over 200 countries around the world. However, there are some locations we are unable to ship to. If you happen to be located in one of those countries we will contact you.

What about customs?

We are not responsible for any custom fees once the items have shipped. By purchasing our products, you consent that one or more packages may be shipped to you and may get custom fees when they arrive to your country.

How long does shipping take?

Shipping time varies by location. These are our estimates:
Location *Estimated Shipping Time
United States 10-30 Business days
Canada, Europe 10-30 Business days
Australia, New Zealand 10-30 Business days
Central & South America 15-30 Business days
Asia 10-20 Business days
Africa 15-45 Business days
*This doesn’t include our 2-5 day processing time.

Do you provide tracking information?

Yes, you will receive an email once your order ships that contains your tracking information. If you haven’t received tracking info within 5 days, please contact us.

My tracking says “no information available at the moment”.

For some shipping companies, it takes 2-5 business days for the tracking information to update on the system. If your order was placed more than 5 business days ago and there is still no information on your tracking number, please contact us.

Will my items be sent in one package?

For logistical reasons, items in the same purchase will sometimes be sent in separate packages, even if you've specified combined shipping.

If you have any other questions, please contact us and we will do our best to help you out.

REFUNDS & RETURNS POLICY

Order cancellation

All orders can be cancelled until they are shipped. If your order has been paid and you need to make a change or cancel an order, you must contact us within 12 hours. Once the packaging and shipping process has started, it can no longer be cancelled.

Refunds

Your satisfaction is our #1 priority. Therefore, you can request a refund or reshipment for ordered products if:

  • If you did not receive the product within the guaranteed time( 45 days not including 2-5 day processing) you can request a refund or a reshipment.
  • If you received the wrong item you can request a refund or a reshipment.
  • If you do not want the product you’ve received you may request a refund but you must return the item at your expense and the item must be unused.

We do not issue the refund if:

  • Your order did not arrive due to factors within your control (i.e. providing the wrong shipping address)
  • Your order did not arrive due to exceptional circumstances outside the control of My Blog (i.e. not cleared by customs, delayed by a natural disaster).
  • Other exceptional circumstances outside the control of https://outdoors.ae

*You can submit refund requests within 15 days after the guaranteed period for delivery (45 days) has expired. You can do it by sending a message on Contact Us page

If you are approved for a refund, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 14 days.

Exchanges

If for any reason you would like to exchange your product, perhaps for a different size in clothing. You must contact us first and we will guide you through the steps.

Please do not send your purchase back to us unless we authorise you to do so.

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