AstroSolar® ECO-size OD 5.0 ​​140x155mm sun filter foil

Solar filter film for solar observation and solar photography.

• Includes instruction manual and cutting template.
• Optical Density (OD, also known as Neutral Density) = 5.0 This is due to the fact that only 1/100,000 of sunlight passes through the filter.
• This filter is tested interferometrically!

On the market for over 25 years , this is the only sun protection filter sheet that does not impair the optical wavefront and allows application at high magnifications without loss of sharpness or contrast!

ECO size: The smaller format makes it suitable for small telescopes, finders, binoculars, spectroscopes and camera lenses and of course it is much more cost effective.