The adapter is faulty. There should be a protuberance on it which pushes
the "spring loaded activator" to its limit as the lens is mounted on the
adapter. The lens then must be manually opened and closed for focus and
exposure.
I'm surprised you got an adapter without that, as the requirement is
clear and well known.
Many inexpensive adaptors are available, on eBay, for example, which
work properly. I can't personally recommend one, as I've not used
OM=>µ4/3, but the same thing is reuired for OM=>EF, which I do use.
There have been posts about here, and I suspect you will get some
repsonses about that.
Moose
On 4/10/2010 8:37 PM, richard mcgrath wrote:
> Hello,
>
> I purchased on eBay an Olympus Zuiko Auto-S 50mm F1.8 lens (the lens is
> marked "Made in Japan"), Serial No. 5870379. Although used, the lens appears
> to be in near-mint condition.
>
> I also purchased an adapter to fit this lens onto a new Panasonic DMC GF1
> micro 4/3 camera body. I take pictures through a research microscope, through
> a telescope, and just for fun. In the first 2 of these cases, focus is
> critical. One of the main reasons for selecting this camera is the live
> on-screen enlargement capability (which is super) as a focusing aid. The
> adapter I have works ok as far as coupling the lens to the camera. There is,
> of course, neither "auto" nor electrical connection.
>
> Here's the problem, with the OM lens mounted on the adapter (or just holding
> the lens in my hand) the iris opens and closes smoothly, but only when
> holding the rectangular button on the side of the lens. Inside the lens is a
> spring-loaded articulator that are clearly designed for automatic control of
> the iris. If I hold this at its limit, it has the same effect as holding the
> rectangular side button, i.e. the iris opens and closes smoothly as the
> f-stop is changed. Left to its own devices, the lens stays wide open.
>
> Bottom line: I don't know if I have a lens that isn't working the way it
> should or if there's some function of the lens that I just don't know about
> or if I have an adapter that doesn't do what it should.
>
> It is clear that lots of folks use adapters to connect any number of lenses
> (including the Olympus OM Series) to any number of cameras. I have fair
> experience with Pentax, Sigma& Vivitar lenses, with adapters to paste them
> onto bayonet or screw mount cameras, and with adapters to paste cameras to
> telescopes and to microscopes, bellows& extension tubes. With the lenses
> I'm familiar with, you turn the diaphragm ring and the iris opens and
> closes---end of discussion. But I'm not familiar with this, my first Olympus
> lens, so a bad lens is a possibility. Is what I have described in paragraph
> # 3 above, the normal operating scheme for the OM Series lenses?
>
> I have a problem here and I'm hoping someone can make some helpful
> suggestions. My problem seems to point to the adapter. I need a good Olympus
> OM lens to micro 4/3 mount adapter and I don't think I should have to pay
> $150 to $250 for it. Can someone suggest a brand of adapter that works the
> way it should with OM Series lenses.
>
> Thanks in advance for your help,
> Richard
>
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