The Moon & Skyglow is a multi-bandpass filter transmitting a high percentage of light in the visual spectrum.
The filter is made with a special Neodymium glass that effectively filters out selective wavelengths of low-pressure sodium and other man-made sources typically used in street lighting.
It enhances contrast of all reddish details and so this filter can also be used for planetary viewing, as well as of blue details.
Very high light transmission exceeding ninety five (95) percent of that light some the portions of the spectrum - while blocking unwanted skyglow and many street light emissions.
By rejecting most other light this will cause certain objects to appear more clearly against a blacker background of space.