Chuck Castleton <ccastleton@xxxxxxxxxx> moved upon the face of the 'Net and
spake thusly:
> 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.
It's certainly *NOT* a varifocal.
> 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?
Depth of field will contract when you increase the focal length.
What *appears* "in focus" at 75mm may *not* be in focus at 150mm.
However, if you focus at 150mm, and zoom out to 75mm, your in-focus
object should remain in focus.
If you see other effects, your lens is faulty.
> 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?
Beware vibration---touch as little of the plane as possible. Try
to get a high-wing plane.
--
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--- Christopher Biggs - Stallion Technologies - chris@xxxxxxxxxxxxxx ---
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