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Q&A Eye safety when starting a fire with a magnifying glass

TL;DR What are some reasonable (ie: safe, portable, reusable) ways to start a fire with a magnifying glass without damaging my eyes from staring at the focused sunlight? Background I recently st...

6 answers  ·  posted 7y ago by Loduwijk‭  ·  last activity 5y ago by System‭

Question fire-starting uv-protection