ITEM NAME:Replacement 0.965inch/24.5mm Nebula Filters Astronomical Telescope Oculares img *{margin:0;padding:0;.1 Piece 0.965" Nebula Filter. Bright, light-polluted skies appear much darker, and the contrast between object and sky is improved significantly. SKU: SVZ0049114577003782. Reduces glare and improves definition so you can see the moons features, craters and "seas" much more clearly.