TAKO. INTERNET SEIT 1996.
Olympus-OM

Re: [OM] Focusing at infinity - 75 / 150 zoom

Subject: Re: [OM] Focusing at infinity - 75 / 150 zoom
From: clintonr@xxxxxxxxxxxxxxxx
Date: Mon, 20 Nov 2000 13:57:33 -0600
One of the more frequent problems with the Olympus 75-150 is separation
of one of the internal lens elements.  You can sometimes see this when
looking though the rear of the lens - hold the lens about a foot from
your eye and look at a light bulb.  Try to focus your eye "inside" the
lens.  Move the lens slightly, looking at the edge of the light bulb -
you might see a faint uneven line through one of the elements inside the
lens.

Simply adjusting the focus isn't a permanent fix if this is the
problem.  This element isn't available anymore, but it can be removed
and recemented.  Condition of the lens will determine if it's worth the
expense.



John Hudson wrote:
> 
> Today I became aware that my  75 / 150 no longer focuses at infinity at
> the infinity marker on the lens barrel. Focusing at infinity is about
> midway between the 30m mark and the infinity mark. By infinity I mean an
> object at least five miles away.
> 
> As an interim measure I treated the focus at infinity as being when the
> split image in the viewfinder of my 4T was in perfect alignment even
> though the lens barrel had perhaps another millimeter to rotate before
> it would rotate no further.
> 
> Can anyone advise me as to whether the lens should be serviced to have
> infinity set to infinity or whether what I have experienced today is
> normal behaviour for this lens.
> 
> John Hudson
> Vancouver, BC
> 
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