It appears as if Olympus went to some lengths to weather-seal the
250/2.0.
For example, although there is no rubber gasket on the lens mount itself
(and it's questionable whether such is *really* required, since the lens
generally fits extremely snugly on the mount, and the widely-acclaimed
OM-4Ti crash test done by the magazine in 1989 proves this), the rear
drop-in filter has no less than two rubber gaskets.
I suspect the focus ring fits so extremely snugly as part of the
weather sealing. I know Canon, for example, started the whole
weather-sealing-as-marketing thing by publishing diagrams of all
the rubber gaskets present in the lenses / bodies etc, but does anybody
know the true extent of this on the white OM Zuiko lenses?
i.e. since the OM-3Ti/4Ti are so well sealed, does it mean that, when
used with
certain lenses like the 250/2.0, 350/2.8 etc the combination is quite
well sealed against e.g. rain?
On 12 Nov 2009, at 4:05 PM, John Hermanson wrote:
> I have seen sticky focus ring on this type of lens several times. The
> tolerances on the fit between the ring and inner barrel are very
> tight.
> Just a little dirt or spilled drink between the edges of the front or
> back edge of the focus ring can eventually gum it up. No impact
> required. I don't think anyone had ever opened this one.
--
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