Manufacturer: Optolong
Product number: OPL-UHC-2

EUR 149,00RRP EUR 199,00you save 25.1% (EUR 50,00)

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Optolong UHC Filter 2" - Light Pollution Filter for Nebulae
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 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 (skyglow).

Together with the highly transparent in main nebula emission lines at OIII (496 nm and 500 nm), H-beta (486 nm), NII (654 nm and 658 nm), H-alpha (656 nm) as well as SII (672 nm), the filter is suitable for enhancing the contrast and details for both visual and photograghic purpose at sub-rural area with heavy light pollution.

Main Use and Performance
Suitable for color astro cameras and unmodified DSLRs
UHC with narrower passband provides higher contrast than CLS. Thus it is more suitable for urban environment where you suffer from severe light pollution.
UHC has a substantial red passband and offer superb views for objects like the Orion Nebula (M42)
Light pollution filter do not increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, but not by brightening the nebula.
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.

Substrate:High-quality optical glass from Schott
Thickness:2.0 mm
Surface Treatment:Fine-optically polished
Surface Polish Quality:60/40 (Refer to MIL-O-13830)
Surface Quality:1/4 wavefront
Transmission nebula lines:approx. 95% at main nebula emission lines (H-alpha 656 nm, OIII 496 nm and 500 nm, SII 672 nm and H-beta 486 nm)
Transmission off-band:approx. 0.1% transmission of off-band, specifically the major emission lines of artificial light pollution
Cell:Filter cell 2", black anodized, laser engraved
Clear Aperture:45 mm
Cell height:5 mm without external thread, 7 mm with M48 external thread
Protective Box

Which side of the filter needs to face towards the telescope?
Optolong has a good explanation on their page with a check on unmounted filters. With mounted filters, it´s easy. The side with the external thread must face the camera.

Link to iOptron page: Should Optolong filters be installed in a certain orientation? (external link)
You can download the generated PDF from our own server.

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Written by Frank Bindel
on 2022-03-31

"Alles bestens"

Written by Steffen Wetzel
on 2019-11-20

"Der Filter zeigt tatsächlich eine Verbesserung. Streulicht der angegebenen Störquellen wird tatsächlich herausgefiltert. Man sollte aber nicht zu viel erwarten. Mir fehlt leider der Vergleich zu anderen Herstellern."