1、Related Parameters: The outer diameter of the frame is 136mm, the size range of the objective lens is 104‑130mm, the light aperture is 112mm, and the screw is M5‑16mm. 2、PET Coated Aluminum Foil Film: This solar observation film is called "solar film" by astronomers, and it is called solar film in the industry. Solar film as a new product, it can be used for visual observation of the naked eye, but also for astrophotography. 3、Solar Film Advantages: The solar film looks at the red and yellow sun. The advantage is that the solar film is not easy to damage, suitable for long term use in the natural environment, especially in photography, do not be afraid of wind and rain. When the film is dirty, you can also clean it with a clean rag and paper towel, or even wash it with water. 4、Reduce Light and Radiation: Solar film in the reduction of light and harmful radiation at the same time, will not reduce the contrast of the subject, that is, the use of solar film as a solar filter can achieve better image quality, and even can easily record the sunspot activity on the surface of the sun. 5、Upgraded Solar Film: The second generation solar film is a film material with bright silver on both sides. Made a thick design, safe and solid observation experience. Products in line with the ISO standard solar filter film can protect your eyes when observing the sun, if the solar film appears before the use of light leakage, please stop using immediately. 1 x Film Solar Filter Item Type: Film Solar FilterWeight: 171g/6ozMaterial: Aluminum alloy and PET and aluminum foilSupport Objective Lens Size Range: 104-130mmAperture: 112mmOuter Diameter of Frame: 136mm