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Old 21st August 2019, 11:34 PM
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Maris Maris is offline
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Join Date: Jul 2009
Location: Noosa, Australia
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It is possible to test an enlarging lens for significant damage by looking at fine (fine!) lines in the image. If the lens is compromised black lines against a light background will come out wider than they should. And white lines against a dark background will come out narrower.
The effect is caused by subtle lens flare that manifests long before actual lens sharpness and resolution start to degrade.
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