One thing I have noticed is that lenses with inner
rotating cams for focusing (at least the 24 shift) are
virtually impervious to internal dust. The new old
shift I got has seen plenty of use and yet there is no
dust in between the elements (although there is a tiny
paint chip on the orange filter). Is that true with
the 180/2, 250/2 and 350/2.8 as well?
--- clintonr@xxxxxxxxxxxxxxxx wrote:
> Actually, very few lenses are "sealed" -- there's
> lots of openings for external
> debris to gain entry between groups. And even for
> those elements that are
> "ganged" into self-contained groups that _are_ more
> or less "sealed", there's
> often anti-reflecting paint here and there that can
> flake off between elements.
>
> All in all, though, there's got to be alot of
> "stuff" there to affect your
> images. Just be wary of fungus -- it sometimes
> seems to grow around debris on
> the elements.
>
> Richard F. Man wrote:
>
> > So how do dust get into the (older) lens? I can
> see fungus growing due to
> > moisture content, but dust? Or may be they are
> paint and whatnot from the
> > interior of the lens?
> >
> > // richard http://www.imagecraft.com
> > [ For technical support, please include all
> previous replies in your msgs. ]
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