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Optolong UHC Ultra-High Contrast Light Pollution Filter

In Stock - Ships Today if Ordered by 3pm! (Tues - Fri)

FedEx Ground Order Cutoff is 11am


We will price-match Canadian astronomy dealer pricing


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The UHC (Ultra-High Contrast) broadband filter is designed to improve the visibility of various deep-sky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lighting such as mercury vapor lamps, both high & low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (skyglow).

The filter is highly transparent in 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). The filter is suitable for enhancing the contrast and details for both visual and photographic purpose in suburban and rural areas with heavy light pollution.

Main Use and Performance

  • Suitable for color CCD cameras and unmodified DSLRs that accept 1.25" filters.
  •  With narrower bandpass transmission gaps, this filter provides higher contrast than CLS filters.
  •  The UHC filter has a substantial red bandpass and offers superb views of objects like the Orion Nebula (M42)
  •  Light pollution filters 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.
Canon EOS FF Available for: EOS 5D/5DmarkII/III and 6D only

Nikon FF Available for: D600/D610/D700/D750/D800/D800E/D810/D810A/DF

Sony FF Available for: A7M/A7M2/A7M3/A7R/A7R2/A7R3/A7S/A7S2/A9

    Returns Policy

    You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

    Items that have been opened, damaged or are otherwise unsaleable will be subject to a minimum 10% restocking fee, to be assessed by Telescopes Canada upon receipt of the returned goods

    You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

    If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.


    We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

    When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

    Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

    Typographical Errors and Order Cancellations

    Telescopes Canada reserves the right to cancel an order due to an error in pricing by Telescopes Canada or one of our suppliers, equipment being no longer obtainable, or other events which are out of our control.

    Client-Initiated Cancellations

    Client-initiated order cancellations are accepted prior to delivery of the equipment to the customer, thereafter it is a return.
    • Schott substrate material
    •  Thickness 2.0 mm (1.25”/2”/36mm/77mm/82mm)
    •  Thickness 1.0 mm (Clip series)
    •  Surface Quality: 60/40 (Refer to MIL-O-13830)
    •  Fine-optically polished to ensure accurate 1/4 wavefront and <30 seconds parallelism over the both surfaces
    •  95% transmission of main nebula emission lines (i.e. H-alpha 656nm, OIII 496nm and 500nm, SII 672nm and H-beta 486nm
    •  0.1% transmission of off-band, specifically the major emission lines of artificial light pollution (i.e. Na 589nm, Hg 435nm and 578nm). Transmission of 0.1% is equivalent to OD3 (Optical Density), and a high optical density value indicates very low transmission, and low optical density indicates high transmission.

    Coating Parameter

    • 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 from 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

    Filter Cell

    • Ultra-thin filter cell minimizes vignetting by maximizing the clear aperture (clear aperture is 26mm for 1.25”)
    •  Aerometal Material | Precise CNC Machining | Sand Blasting Process | Black Anodized Finish | Extinction Treatment to Prevent Reflection | Laser Engraving No Fading


    • Plastic PP Case | Imported High Pressure EVA Case Lining | Silver Cardboard Box | High Density Sponge Carton Lining


    • Standard 1.25”
    The Major Emission Lines of Nebulae
    • H-β486.1nm OIII 495.9nm OIII 500.7nm H-α656.3nm
    The Major Emission Lines of Artificial Light Pollution
    • Hg 435.8nm 546.1nm 577nm 578.1nm
    • Na 598nm 589.6nm 615.4nm 616.1nm

    Questions & Answers

    • I have a Nikon D5500 with an Ha modification. I would like to use this at the front of a Nikon 180mm. I usually stop down to f3.5 which means a ~52mm effective aperture. The 2" at 48mm of this filter is close enough. My question is whether this will thread into standard 48mm step down filter adapters? Do you carry a 52mm to 48mm step down. There is no clip in option for the Nikon DX.

      Yes, the Optolong filters will fit in a standard M28 thread.  We don't have M52 to M48 adapters though