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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
Coating Parameter
Filter Cell
Package
Size
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
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