Do Zoom Lenses Filter the Air that Enters when Lengthening?

Started 6 months ago | Discussions thread
dincz Regular Member • Posts: 439
Re: Do Zoom Lenses Filter the Air that Enters when Lengthening?

Gerry Winterbourne wrote:

Chas Tennis wrote:

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?

Nothing keeps air out; if it did you'd be fighting against vacuum every time you tried to extend, and against internal pressure when you try to withdraw.

I assume he meant "airborne particles".

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