1Solar Filter Parameters: Bezel outer diameter 96mm, support objective lens size range 6490mm, pass through aperture 72mm, screw M5 16mm. 2Solar Films In Essence: They are actually solar filters, but different from solar filters. Astronomical telescopes must add a filter to observe the sun. Otherwise, it will damage the eyes and instruments. The sun is so bright that it is easy to find the sun in a mirror, even with the addition of a solar film. 3PET Coated Aluminum Foil Film: This type of solar viewing film is called 'solar film' by astronomers, and is known in the industry as solar film. Solar film as a new product, it can be used for eye observation when visual use, but also for astrophotography. 4Advantages Of Solar Film: Solar film looks at the reddish yellow sun. The advantage is that the sun film is not easy to break, suitable for natural environment for a long time, especially in photography, do not have to be afraid of wind and rain. When the film is dirty, it can also be cleaned casually with clean rags and paper towels, and even water washing is not a problem. 5Light And Radiation Attenuation: Sun film attenuates light and harmful radiation without reducing the contrast of the subject, which means that better image quality can be achieved by using a sun film as a solar filter, and even the spade activity on the surface of the sun can be easily recorded. 6Upgraded Solar Film: the second generation solar film is a bright silver colored film material on both sides. Made thickened design, safe and solid observation experience. The product meets the ISO standard solar filter film can protect your eyes when observing the sun, if you encounter the sun film appears to leak light before use please stop using it immediately.1 x Solar Film Filter