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OPTOLONG 2″ CLS Filter City Light Suppression Broadband Filter Photography for Astronomy Telescope Monocular LD1002B

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OPTOLONG 2″CLS City Light Suppression Light Pollution Broadband Filter Photography

Description
The City Light Suppression broadband filter is designed to improve the visibility of various Deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings 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). Together with the highly transparent in main nebula emission lines at OIII(496nm and 500nm), H-beta (486nm), NII(654nm and 658nm), H-alpha(656nm) as well as SII(672nm), the filter is suitable for enhancing the contrast and details for both visual and photographic purpose at sub-rural area.
Features:
  1. Multi-layers anti-reflection coating
  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) no deviation affected by temperature change.
  4. Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.
  5. Ultra-thin filter cell minimize vignetting by maximize possible
  6. Aerometal Material Precise CNC Machining Sand Blasting
  7. Process Black Anodized Finish Extinction Treatment to
  8. Prevent Reflection Laser Engraving No Fading
  9. 95% transmission of main nebula emission lines (i.e. Ha 656nm, OIII 496nm&500nm, SII672nm and H-beta 486nm).
  10. 0.1% transmission of off-band, specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nmand 578nm).
  11. Suitable for color CCD cameras and unmodified DSLRs
  12. CLS with wider pass-band than UHC and hence is more favored when observing under mild to moderate light pollution.
  13. Light pollution 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.
  14. 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.
Specifications:
  1. Brand: OPTOLONG
  2. Type: City Light Suppression Filter (CLS Filter)
  3. Material: Optical glass lens, Aluminum Frame
  4. Shape: Round
  5. Thread: Standard M48*0.75mm
  6. Net Weight: 5.2g / 0.18oz
Package Includes:
  • 2″ OPTOLONG CLS Telescope Filter

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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.

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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.

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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.

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*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.

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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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