The focus ring fit is all metal. Water could get into spaces around the
diaphragm ring, rusting small parts you can't see.
___________________________________
John Hermanson | CPS, Inc.
21 South Ln., Huntington NY 11743
631-424-2121 | www.zuiko.com
Olympus OM Service since 1977
Gallery: www.zuiko.com/album/index.html
Dawid Loubser wrote:
> 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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