Not sure Merlin, I had it on my camera and looked through the view finder to align the sun, image was too bright, BUT 3-4hrs later I developed a pain in my left eye (same one I look through the camera with) Pain was similar to welding flash, It eventually passed after a few hours. Hopefully nothing bad happened, but eyesight today feels fine. I have since scrapped it and will get another to be on the Safer side...
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