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  • product details

UHC - E  the OPTOLONG company specifically for the Eye and  detrusion a city light pollution filter, due to the existence of the background of the skylight, not observed in the starry sky, filter through the IAD nano coating, ion selective blocking some harmful wavelengths of light, 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 photograghic purpose at sub-rural area with heavy light pollution.









Filter production process:

Optical high-precision double-sided polishing, to ensure that the parallel degree above 30 "and high flatness 1/4

lambda, to ensure that does not affect the imaging quality of the image.

precision optical coating, the two slices of bread, effectively increase the transmittance and by the depth.

Evaporation technology, electron Gun (E - Beam Gun)

Ion source assisted deposition (IAD) technology, improve the film density, ensuring maximum reduce the filter wavelength is influenced by temperature and the temperature drift.

High uniformity of planet wheel coating fixture, improve the uniformity of filter wavelength


Metal frame:

High quality aviation aluminum


Precision CNC integration


Optical instrument professional fine sand blasting and anode processing, in the box to do extinction processing, prevent reflection




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


Standard 1.25” & 2” 




Filed under: Eyepieces & Accessories