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Why do objectives usually have a color ring on them?

color ring usually
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Why do objectives usually have a color ring on them?

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With standard colours for most manufacturers, these rings make it easy to identify the magnification of the objective: A red ring means 4X or 5X. A yellow ring means 10X. A green ring means 20X. A blue ring means 40X, 50X or 60X. A white ring means 100X.

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