Re: Dust in Lenses

[Alan Chan]

It is my hypothesis that telephotos (except IF ones, of course) tend
to exchange more air while focusing back and forth (with their
usually longer helicoids) than do most wide angles, and so they end
up sucking in more dust.  ;-)

Unfortunately, FA135/2.8 & FA*200/2.8 are IF, and they still suck more dust than my other lenses. :(

regards,
Alan Chan

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