Date: Tue, 28 Aug 2001 12:56:24 -0500
From: clintonr
Subject: Re: [OM] S Zuiko 100~200 f/5 Question
This is quite normal for this model -- that, and the zoom tends to slip when
you point it downwards. The rollers wear out, but they are no longer
available. We've experimented with adapting parts from another lens to
correct
this....
Normal WEAR? Would this suggest that, even though the lens appears to be in
mint condition, it actually has a lots of use, or are the internal parts of
this lens less rugged than other Zuiko designs (given that it is a S
Zuiko)? I do notice a slight change in the drag of the barrel at either end
of the zoom range, but the focus is smooth throughout.
Curtis P. Hedman wrote:
> I have a new (to me) S Zuiko 100~200 f/5 zoom, and I would like to poll the
> List experts on something I noticed about the lens: the helicoid focus
> mount stop is a fair amount beyond the infinity mark on the lens barrel.
> When using the lens, I find that the infinity (or at least long range)
> focus point is about where the infinity mark is on the barrel - i.e. the
> lens can focus 'beyond infinity' [or to quote Buzz Lightyear in "Toy
> Story", "To Infintiy and Beyond"! Does anyone know if this is typical of
> the 100~200? Or perhaps of the S Zuiko series? The lens I have is in
> beautiful shape cosmetically, and takes very sharp pictures, so I don't see
> this 'over focussing' as an issue.... more of a curiosity point. Any wise
> words will be appreciated! Curt
>
------------------------------
Date: Tue, 28 Aug 2001 14:19:01 -0400
From: "John Hermanson"
Subject: Re: [OM] S Zuiko 100~200 f/5 Question
The infinity focus of the 100-200 would register like a sine wave as you
zoomed back. Focus ring has to go a little beyond the infinity mark
because lens will not hold infinity.
John Hermanson
Contrary to the other response to my question, which says this behavior is
due to internal wear, you suggest that this is the way the lens is designed
- that it is slightly varifocal versus a true zoom, at least at infinity.
Given the 'one touch' design this would not be much of a problem
operationally, but it still comes as a bit of a surprise! Do any other
Zuiko zooms exhibit a similar behavior?
I emotionally prefer John's answer, as it means my lens might not have
significant wear! Unfortunately Paul Schings' response notes his 100~200
does not seem to exhibit the 'beyond infinity' condition.... anyone else
care to put in their two cents on this one? I plan to see if I can observe
the sinusoidal infinity position with my copy of the lens in the next day
or so.....
Thanx for all inputs, as always.
Curt
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