A Zoom requires careful calibration so it will HOLD focus while zooming
back, yours is probably out of adjustment. Also, keep in mind that
zooms only hold focus when zooming from the telephoto position to the
wide position, not vice versa.
John
Camtech
http://www.zuiko.com
Chuck Castleton wrote:
>
> Well, in the last month I've discovered both this list and EBay. It's
> been kind of a yin-and-yang, Jekyll-and-Hyde thing, but it has rekindled
> my passion for my OM setup.
>
> I recently purchased a Zuiko 75-150 f4 from a local repair shop. It's
> a great lens. However, everything I've read on Hans' SIF web site and
> other sources says this should be a true zoom lens - i.e. no refocusing
> required when you change the focal length. This is definitely not the
> case with my lens - I have to refocus after zooming. Are there
> different versions of the 75-150? Did I get a lemon? Should the shop
> be able to readjust to correct this problem?
>
> Another question - I'm going to Alaska next month and may get a chance
> to do some flying in a small plane. Any suggestions for getting good
> aerial shots with my OM-1?
>
> Chuck Castleton
>
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