This size of this AstroSolar Safety Film covers telescope up to 20″ diameter. Or you can use it to make a wide variety of filters for all your binoculars, telephoto lenses or smaller telescopes. Share this big size film with the members of your astronomy club or your family! Neutral Density 5.0 is ideal for visual observing and normal photography. Only when you are an experienced Astrophotographer with an high end telescope (apochromatic refractor with more than 5″ diameter or large mirror telescopes) and work with high magnification, the Neutral Density 3.8 (SKU 2459280) will make sense for you.
More Information about AstroSolar Safety Film OD 5.0:
AstroSolar Safety Film