If you want to capture stunning images of the sun and its features, you need a solar filter that is made with the best materials and technology. That’s why we offer you our Hyperion Solar Film solar filter, which is the ultimate choice for solar photography. Hyperion Solar Film is a thin and flexible film that has a special coating on both sides that blocks 99.999% of the sun’s harmful rays, making it safe for your eyes and your camera. The film is also very durable and resistant to tears and punctures. Hyperion Solar Film has a high resolution that gives you a clear and crisp view of the sun. You can see the sun’s surface details, such as sunspots and granulation, as well as spectacular events, such as solar eclipses and planet transits. The sun will appear in a beautiful yellow-orange color that will enhance your photos. Our solar filter is easy to use and fits most optical devices. It has a slip on design that allows you to slide it over the sky end of your optical tube or lens securely. The filter is secured and centered on the optical tube or lens with a nylon thumb screw(s) and felt tabs. SIZING: You must measure the outside diameter of your optical tube or lens before ordering the solar filter. To measure the diameter, you can use a ruler, tape measure, or caliper. You want to measure the widest distance across the end of your optical tube or lens. Measure from the outside of the casing on one side, across the center, to the outside of the casing on the other side. Order the solar filter size that is just larger than your measurement. You are comparing your measurement with the solar filter’s inside diameter. For example: A measurement of 4" (102mm) across the end of the optical tube would require a solar filter with an inside diameter of 4.25" (114mm) because it is the size just larger than your measurement. With our Hyperion Solar Film solar filter, you can enjoy the sun’s beauty and power without any risk or hassle. If you are not sure this is the right size filter for your optical device please click HERE, "How do I find the right size filter to order?"