Before each and every solar observing session, inspect your AstroSolar® Film for mechanical damages, broad scratches, streaks, extensive wipe marks and other quality degrading influences. Also check the filter’s fit and, if necessary, tape it to prevent slipping.
Never use the filter at the eyepiece (where you look into the telescope), only attach it onto the objective (where light enters the telescope); otherwise it can become dangerously hot inside the instrument – and inside the eyes. In case of binoculars, be sure both objectives are securely covered; with cameras cover the viewfinders front lens.
A filter made of this durable material is relatively resistant to breakage (even during intentional attempts) in comparison to a glass filter. However, care must be taken with sharp pointed objects. Also be aware that the coating can be damaged by scratching or rubbing and take this into account when storing the filter. A filter with damaged film should be destroyed immediately to avoid accidental use.
Emphasize the importance of caution to those observing with you, especially children. Intentionally removing or damaging the filter can endanger their eyesight. This is no place for jokes. Never leave the telescope outside unattended during the daytime!
Do not use AstroSolar® Film with open-truss telescopes unless the tube is covered by a shroud. Always cover additional finderscopes and telescopes with a securely fastened lightproof front cover. Unprotected viewing through the finder would have the same catastrophic consequences as viewing through the main telescope. Additionally, an uncovered finder directed at the sun can produce exceedingly unpleasant skin burns.
