Description: This solar filter film could filter the sun's rays efficiently,allow you view the sun safety. Two sides high density coating without streak and blister point ensure the safety of the user eye. High density coating aslo eliminate pinhole effect provide sun's true color neutral white,not blue or orange. The 90mm solar filter will fit a telescope with an internal objective tube diameter of about 112mm. It can also be used on a telescope with an external tube diameter of about 102mm although it is designed for internal tube fitting. Main performance: observation of sunspots, solar eclipse and other astronomical scene. Specification: Product Type: Bard Film Applicable Models: 90mm Caliber Universal Optical Density: 5.0 Aperture of the Telescope Outside Diameter: 111mm Inside Diameter: 103m Material: Metal Frame + Glass Package Includes: 1 Piece Solar Filter Lens Cap
