Safety Warning –
how to protect your eyes

Important hints for visual safety, please read before use. Never watch the sun without protection.

  • Direct solar observation without additional optics ONLY with Solar Viewer AstroSolar® Silver/Gold.
  • For Solar Observation with Telescope, Binocular, Spotting Scope or Camera use our AstroSolar® Safety Film 5.0.
  • AstroSolar® Foto Folie 3.8 ist keinesfalls für visuelle Beobachtung geeignet.

Avoid absolutely all forms of unprotected solar viewing! Your eyes could suffer irreparable damage. Smoked glass, darkened film negatives, CDs or doubled sunglasses do not offer sufficient protection, even at sunrise or sunset.

AstroSolar® Safety Film 5.0 is not authorized to be used for naked eye solar observation or production of solar viewers. For direct solar viewing without telescope, binocular or camera optics, inquire for our EN ISO 12312-2:2015 certified eclipse shades equipped with AstroSolar® Silver/Gold Film.

AstroSolar® Safety Film 5.0 reduces the intensity of incident sunlight by a factor of 100,000. According to current medical research, the filter (when used together with additional optics) provides complete protection against thermal damage to the retina (photocoagulation).

Under certain circumstances, any intense source of light (e.g. spotlight, laser beam, welding arc, the sun) may trigger photo-toxic processes in the eye. In extreme cases, such reactions can have an additive effect over time, leading to deterioration of the vision.

Please note: this filter provides protection similar to good welding glasses, but even these glasses are not meant for uninterrupted use – there are no studies which prove that welding glasses completely hinder phototoxic reactions with absolute safety during long-time use, and the same reservations must apply to this solar filter.

Therefore, exercise your own best judgment when using this product.

Although we have never heard of a single case of eye damage in 25 years of sales of this product to thousands of telescope users, and knowing that welders ply their trade for years, while the solar filter’s use can be measured in minutes, we want to inform you about the current state of scientific knowledge.

In any case, it is advisable to interrupt solar observation occasionally and look at other objects. If you have any doubts at all, especially in cases of known excessive eye sensitivity, consult your ophthalmologist or optician.

Do not use any solar observing product if you do not feel well informed about possible hazards and the consequenses of wrong handling.

Solar products are not intended for those under 14 years of age.

Never leave your Solar Telescope outside unattended to prevent children or uninformed visitors from looking at the sun without proper guidance!


Posted in Safety Instructions.