Optolong UHC Light Pollution Filter
2" (2 inch)
Description
Ultra High Contrast (UHC) Filter - Block Common Light Pollution Sources and Helps Increase the Visibility of Various Deep Sky Objects
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 vapour lamps, both high & low pressure sodium vapour lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).
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 purposes at sub-rural area with heavy light pollution.
IMPORTANT: Filters manufactured by Optolong are NOT designed for observing or photographing the Sun. DO NOT use Optolong filters to observe or photograph the Sun. If you do it will result in permanent eye damage!
FEATURES
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)
Suitable for use with colour CCD and CMOS cameras and unmodified DSLRs
Narrower pass-band than CLS filter - Better suited for areas of higher light pollution UHC has a substantial red passband and offers superb views of objects like the Orion Nebula (M42)
1.25" or 2" Mounted Sizes, EOS-C, EOS-FF and Nikon-FF Clip filters
Supplied in a protective plastic case with EVA foam lining
1mm (Clip Filters) or 2mm (1.25" / 2") Thick Schott Glass
Fine-optically polished on both sides - ensures accurate λ/4 wavefront and <30 seconds parallelism over the both surfaces
Technical Data
Schott substrate material
Thickness 2.0 mm (1.25”/2”)
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 affected by 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 minimise vignetting by maximise possible clear aperture (clear aperture is 26mm for 1.25”; 45mm for 2”)
Aerometal Material | Precise CNC Machining | Sand Blasting Process | Black Anodised Finish | Extinction Treatment to Prevent Reflection | Laser Engraving No Fading
Transmission Chart
Red Line - Represents the transmission curve of the UHC Filter.
Green Line - The Major Emission Lines of Nebulae: H-α (656.3nm), H-β (486.1nm), OIII (495.9nm) and OIII (500.7nm)
Orange Line - The Major Emission Lines of Artificial Light Pollution: Hg / Mercury (435.8nm, 546.1nm, 577nm and 578.1nm), Na / Sodium (598nm, 589.6nm, 615.4nm and 616.1nm)
You will receive
1 x NEW Boxed Optolong UHC Filter 2" Supplied in a protective plastic case with EVA foam lining
Shipping
Domestic buyers:
Usually we ship within 24 hours. Free postage may take up to 3-7 days to be delivered unless. Please refer to our listings for more information on shipping. If you live in the remote location then please contact us first. Extra charges may apply.
International buyers:
Our postage charges are generic. Lets us to adjust it for you. You may pay less. However, on some occasions we have to charge extra depending on your locations, for example, remote locations like some islands.
Custom fees of your country are not included in postage charges unless it is clearly stated in our listing.
Returns
If for any reasons you are not happy with the item you can return it.Items must be returned in original condition within 14 days.
PLEASE keep in mind that if you received a damaged package or item then you need to contact us immediately during 72 hours to resolve the issue. PLEASE take photos of a damaged package prior opening it. Thank you.
All of our items tested prior dispatch for your peace of mind.We would not be able to issue a refund for any tampered, damaged, fake etc items.
Any Questions?
Just drop us a message or give us a call, number is at the top
Skywatcher celestron meade janek TAL orion bresser tasco takachashi william optics televue stellarview feathertouch telescope eyepiece filter spotting scope astronomy diagonal lens refractor reflector focuser red dot finder webcam CCD DSLR camera adaptor Pentax Takahachi TeleVue Phillips Miyauchi Fuji cARL zEISS FUJINON LEICA NIKON CANON KOWA opticron swarovski binoviewer binoculars baader astronomik spotting scope secondary mirror primary mirror
Description
Ultra High Contrast (UHC) Filter - Block Common Light Pollution Sources and Helps Increase the Visibility of Various Deep Sky Objects
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 vapour lamps, both high & low pressure sodium vapour lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).
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 purposes at sub-rural area with heavy light pollution.
IMPORTANT: Filters manufactured by Optolong are NOT designed for observing or photographing the Sun. DO NOT use Optolong filters to observe or photograph the Sun. If you do it will result in permanent eye damage!
FEATURES
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)
Suitable for use with colour CCD and CMOS cameras and unmodified DSLRs
Narrower pass-band than CLS filter - Better suited for areas of higher light pollution
UHC has a substantial red passband and offers superb views of objects like the Orion Nebula (M42)
1.25" or 2" Mounted Sizes, EOS-C, EOS-FF and Nikon-FF Clip filters
Supplied in a protective plastic case with EVA foam lining
1mm (Clip Filters) or 2mm (1.25" / 2") Thick Schott Glass
Fine-optically polished on both sides - ensures accurate λ/4 wavefront and <30 seconds parallelism over the both surfaces
Technical Data
Schott substrate material
Thickness 2.0 mm (1.25”/2”)
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 affected by 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 minimise vignetting by maximise possible clear aperture (clear aperture is 26mm for 1.25”; 45mm for 2”)
Aerometal Material | Precise CNC Machining | Sand Blasting Process | Black Anodised Finish | Extinction Treatment to Prevent Reflection | Laser Engraving No Fading
Transmission Chart
Red Line - Represents the transmission curve of the UHC Filter.
Green Line - The Major Emission Lines of Nebulae: H-α (656.3nm), H-β (486.1nm), OIII (495.9nm) and OIII (500.7nm)
Orange Line - The Major Emission Lines of Artificial Light Pollution: Hg / Mercury (435.8nm, 546.1nm, 577nm and 578.1nm), Na / Sodium (598nm, 589.6nm, 615.4nm and 616.1nm)
You will receive
1 x NEW Boxed Optolong UHC Filter 2"
Supplied in a protective plastic case with EVA foam lining
Shipping
Domestic buyers:
Usually we ship within 24 hours. Free postage may take up to 3-7 days to be delivered unless. Please refer to our listings for more information on shipping. If you live in the remote location then please contact us first. Extra charges may apply.
International buyers:
Our postage charges are generic. Lets us to adjust it for you. You may pay less. However, on some occasions we have to charge extra depending on your locations, for example, remote locations like some islands.
Custom fees of your country are not included in postage charges unless it is clearly stated in our listing.
Domestic buyers:
Usually we ship within 24 hours. Free postage may take up to 3-7 days to be delivered unless. Please refer to our listings for more information on shipping. If you live in the remote location then please contact us first. Extra charges may apply.
International buyers:
Our postage charges are generic. Lets us to adjust it for you. You may pay less. However, on some occasions we have to charge extra depending on your locations, for example, remote locations like some islands.
Custom fees of your country are not included in postage charges unless it is clearly stated in our listing.
Returns
If for any reasons you are not happy with the item you can return it.
Items must be returned in original condition within 14 days.
PLEASE keep in mind that if you received a damaged package or item then you need to contact us immediately during 72 hours to resolve the issue. PLEASE take photos of a damaged package prior opening it. Thank you.
All of our items tested prior dispatch for your peace of mind.
We would not be able to issue a refund for any tampered, damaged, fake etc items.
Any Questions?
Just drop us a message or give us a call, number is at the top
Just drop us a message or give us a call, number is at the top
Skywatcher celestron meade janek TAL orion bresser tasco takachashi william optics televue stellarview feathertouch telescope eyepiece filter spotting scope astronomy diagonal lens refractor reflector focuser red dot finder webcam CCD DSLR camera adaptor Pentax Takahachi TeleVue Phillips Miyauchi Fuji cARL zEISS FUJINON LEICA NIKON CANON KOWA opticron swarovski binoviewer binoculars baader astronomik spotting scope secondary mirror primary mirror