Do Zoom Lenses Filter the Air that Enters when Lengthening?

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Chas Tennis Contributing Member • Posts: 898
Do Zoom Lenses Filter the Air that Enters when Lengthening?

When zoom lenses adjust by motor or are adjusted by hand and the length and volume of the lens increases, air must enter the lens for each operation. My compact zoom lens telescopes down and withdraws into the camera body. What's done to keep air particles out of the zoom lens?

One serious problem with automatic motorized zoom lenses is that one day the lens may fail to operate. Might that be often due to particulates in air building up in the mechanism of the lens?

Also, dust would accumulate on the lens surfaces inside the zoom lens.

What is done to filter the air that enters zoom lenses every time their length increases?

Chas Tennis

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