Sun filter foil 20 x 29 cm

Solar filter film for solar observation and solar photography

• Includes assembly instructions and cutting template
• Optical density (OD, also known as neutral density) = 5.0 This means that only 1/100,000 of the sunlight passes through the Filter.
• This film has been interferometrically tested!

Available on the market for over 25 years, this is the only solar filter film that does not degrade the optical wavefront and allows use at high magnification without loss of sharpness or contrast!

^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.