Do Zoom Lenses Filter the Air that Enters when Lengthening?

Started 6 months ago | Discussions thread
Gerry Winterbourne Forum Pro • Posts: 18,700
Re: Do Zoom Lenses Filter the Air that Enters when Lengthening?
3

Bodkins Best Photography wrote:

Chas Tennis wrote:

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

Chas Tennis

Absolutely nothing! The only way around this is using a prime lens.

And that doesn't help with traditional lenses that extend/withdraw to focus.

However, modern lenses that focus and/or zoom internally are immune.

So the answer isn't primes; it's internally acting lenses of either type.

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Gerry
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First camera 1953, first Pentax 1985, first DSLR 2006
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