Sun filter foil AstroSolar® ECO-size OD 5.0 140x155mm

Solar filter film for sun 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 the sunlight passes through the filter.
• This filter is interferometrically tested!

For over 25 years on the market, this is the only sun protection filter foil which does not impair the optical wavefront and allows the application at high magnification without sharpness or contrast loss!

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

^AstroSolar® Safety Film is manufactured from a special film free of streaks and bubbles and, with a thickness of just 0.010 mm, achieves the optical quality of plane-parallel glass filters. The backing material is not ‘Mylar’! This film was originally developed for laboratories engaged in nuclear and particle physics research.

Unlike glass filters,^AstroSolar® is almost entirely free of pinholes (holes in the reflective layer), as it is coated on both sides. The coating is subject to constant quality control. The filter’s effectiveness and safety for solar observation are regularly measured. The quality of the solar image and eye safety are incomparably better than when using so-called emergency films or similar aids, which must be used in multiple layers.

The development of^{the AstroSolar®} film was made possible solely by the enormous demand during the 1999 solar eclipse. During trials, dozens of kilometres of film were destroyed in order to develop the manufacturing processes for a film that is completely uniform at the molecular level on our behalf.