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Home / Products / UHC Clip Filter for Canon FF
UHC Clip Filter for Canon FF

Optolong

UHC Clip Filter for Canon FF

$195.00

UHC Light Pollution Clip Filter for Canon FF Cameras

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 (i.e. skyglow).

Main Use and Performance

  • Suitable for color CCD 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 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.

Format

This filter is sized to clip into a Canon full frame camera.

For a comparison and review of the light polution filters see
    Amit Kamble's Comparison

 

Note: Clip in filters can cause some cameras to have issues with some camera body/lenses

Spectral Curve
Technical Data
Delivery
  • 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

    • Schott substrate material
    • Thickness 1.0 mm
    • 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

    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 minimize vignetting by maximize possible clear aperture (clear aperture is 26mm for 1.25”; 45mm for 2”)
    • Aerometal Material
This item is normally shipped by Courier. Estimated shipping cost is: Nationwide $6.00 Rural Delivery $10.00 Actual shipping cost will depend on the whole order and will be confirmed on your invoice.