“Do these have an expiration date? I know the cheap paper ones do, because the lenses degrade over time, which leaves me curious about these. Thank you so much!”
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There is no expiration on eclipse filters that are ISO 12312-2, as are all Celestron solar filters, but please inspect them for scratches, punctures, or tears if they have been stored for long periods.
Sorry, there was a problem. Please try again later.No—but make sure iso—international standards organizations and nasa updates standards. Science advances. We only know so much today what is safe. Besides, our ozone layers may be busted faster letting in new rays in—then glasses /materials may have to be changed to provide the protection we need.
Sorry, there was a problem. Please try again later.No expiration date given, could be used for extended period, but are probably also subject to some degradation, likely slower as these are thicker lenses.
Sorry, there was a problem. Please try again later.No expiration date listed on viewer or on box.
Sorry, there was a problem. Please try again later.Yes
Sorry, there was a problem. Please try again later.I imagine these have the same type of expiration date, since they are similar material. BUT the experience with them was worth it - really magnified!
Sorry, there was a problem. Please try again later.5 yrs
Sorry, there was a problem. Please try again later.The directions say, "Discard and do not use after 3 years."
Sorry, there was a problem. Please try again later.There is no expiration date
Sorry, there was a problem. Please try again later.No
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