Astromania 2" Moon / Skyglow Filter

Product description ：

The filter is a multi-band pass filter which transmits a high percentage of light in the visual spectrum. It will enhance contrast when observing brighter objects such as the moon and planets and in the same time will suppress sky glow from artificial lighting and background reflected glow. The filter has a mild effect of darkening the background of the night sky so that the fainter objects will be against the dark background, excellent for observing planets. The filter will fit all standard sized 2" eyepieces and accessories such as Barlow lens etc. It is mounted in a nicely anodized Al alloy housing and is threaded on both sides for stacking with other 2" filters if necessary.

Specifications：

♦ 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.