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This lens, same as (for example) the SELP18105G (E-mount APS C 18-105mm/f4 Power Zoom) is fixed-length, meaning there is nothing moving on the outside.

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Except for the autofocus mechanics of course. Those move around before every shot...

GP meant that while doing so, the physical length of the lens doesn't change, and I assume that means the amount of air inside remains the same.

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