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Solomark 80mm Solar Filter Please Measure Your Telescope Objective Diameters: The 80mm solar filter will fit a telescope with an external objective tube diameter of about 100.5mm. It can also be used on a telescope with an internal tube diameter of 105mm although it is designed for external tube fitting. Features: Brand new and high quality The Solar Filter is for telescopes dew tube front end diameter 80mm Safely observing the sun without damaging your eyes Product Type: Bard film Applicable models: 80mm caliber Universal Optical density: 5.0 Aperture of the telescope Outside diameter: 104mm Inside diameter: 101m Material: Plastic CAUTION: Don't use cracked solar filter Don't use bad quality solar filter Don't look directly at the sun Never look at the Sun, either directly or through a telescope, without a professionally made protective solar filter installed that completely covers the front of the instrument, or permanent eye damage could result.