Bill, just for the record, I wasn't the one who determined that the large batch of glasses that NASA ordered was defective. I have nothing to do with NASA and I've not evaluated their glasses or any other product. As I explained, I don't know what the defect was or any other details. I was just passing along information that had been told to me. We designed our 8,000 solar glasses and had them custom made. (I even had one visitor trade his Thousand Oaks glasses for our custom "souvenir quality" Bryce Canyon glasses - ours are that much nicer.) Our supplier used Thousand Oaks film in ours. I believe that in their marketing both Thousand Oaks and our supplier make clear that the film is not to be used with a telescope or binoculars in front of the light path. No film of which I'm aware is designed to withstand the focused light and heat from any other optical system, as we all know. I'm sure that aluminized or mylar film would have melted/burned just as quickly. That is all that we were trying to demonstrate to our visitors, for their safety. We are much less concerned about potential lawsuits than we are about simply protecting the health and safety of both employees and visitors. I also saw your follow-up post, but I just wanted to be clear. Kim -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of William Lockman Sent: Thursday, May 24, 2012 8:59 AM To: Utah Astronomy Subject: Re: [Utah-astronomy] need answer It appears to me that Kim evaluates them as defective because they burn through if used behind the eyepiece, thus being a danger from a litigation point of view for whoever is passing them out and to the eyes of those who don't get it to the point that they use them behind the eyepiece even when warned not to.