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The Flashlight Test

No.3310145 ViewReplyOriginalReportDownload thread
https://kenrockwell.com/tech/flashlight-test.htm

Nothing pisses me off like morons putting a flashlight up to their lenses and being aghast when they don't look crystal clear.

Look, guys if you can hold a lens up to a standard house light and not see any noticeable scratches or haze these things are not going to have a noticeable impact on the final images taken with the lens. If you hold a flashlight up to a lens, it will show you everything potentially wrong with a lens but also will greatly over-exaggerate these flaws because you are putting way more light through the lens than even the sun will on a standard sunny day.