Important note : Please measure the outer diameter of your astronomical telescope before purchasing, because the size marked on your astronomical telescope is the inner diameter, and our products need to be installed on the outer diameter. Please browse the details carefully to purchase a matching model. Product Brief: This solar filter film could filter the suns rays efficiently,allow you view the sun safety Two sides high density coating without streak and blister point ensure the safety of the users eye High density coating also eliminate pinhole effect provide suns true color neutral white,not blue or orange Fit for all 70mm to 152mm Aperture Telescope. Product Parameters: Border Material: Aluminum Can Be Fixed Diameter: 50-72mm Through Aperture: 55mm Bard Film Density: 5.0 Border Material: Aluminum Can Be Fixed Diameter: 70-92mm Through Aperture: 75mm Bard Film Density: 5.0 Border Material: Aluminum Can Be Fixed Diameter: 90-112mm Through Aperture: 95mm Bard Film Density: 5.0 Border Material: Aluminum Can Be Fixed Diameter: 110-132mm Through Aperture: 115mm Bard Film Density: 5.0 Border Material: Aluminum Can Be Fixed Diameter: 130-152mm Through Aperture: 135mm Bard Film Density: 5.0 Border Material: Aluminum Can Be Fixed Diameter: 150-172mm Through Aperture: 155mm Bard Film Density: 5.0 Border Material: Aluminum Can Be Fixed Diameter: 170-192mm Through Aperture: 175mm Bard Film Density: 5.0 Border Material: Aluminum Can Be Fixed Diameter: 190-222mm Through Aperture: 200mm Bard Film Density: 5.0 Border Material: Aluminum Can Be Fixed Diameter: 220-225mm Through Aperture: 230mm Bard Film Density: 5.0 PS. Please measure your telescope hood outer diameter before buy Determining meet Can Be Fixed Diameter,Can use. CAUTION: 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.