Puffing zoom dust

Started 1 month ago | Questions thread
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Bob
Bob Veteran Member • Posts: 3,464
Puffing zoom dust
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I noticed that my zoom lenses puff air through the rear opening.  One is a Nikon, the other a Sigma.  Do all zoom lenses puff air?  Is that just an unavoidable consequence of being able to change the focal length?

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