The High Point ND96 Neutral Density filter allows 13% of light to pass through the filter and into your eyepiece. This is great for looking at the moon because it won"t allow the light to overpower your view and therefore delivers greater image detail at the eyepiece. The ND96 Neutral Density filter from High Point is a 1.25" filter and threads into 1.25" eyepieces, diagonals and extension tubes. As an added bonus this filter has threads on the top side which allows for the stacking of additional filters so you can customize your observing experience. Included, free of charge is a protective case for this filter.