Cracks, scratches, dust, fungus, and haze are all invisible until you shoot a ph... | Hacker News

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		skhr0680 on Sept 9, 2024 \| parent \| context \| favorite \| on: 2.7-meters Telescope mirror shot 7 times (1970) Cracks, scratches, dust, fungus, and haze are all invisible until you shoot a photo with strong light in it. It’s mentioned and shown in the article.

SoftTalker on Sept 9, 2024 [–]

It's like driving at night with a dirty windshield. You don't really notice until you meet an oncoming car with bright headlights. Or similar in the daytime, when you're driving into the sun.

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