There is nothing wrong with your lens. All Zuiko lenses are the same:
the difference between full aperture and the the first stop is less
that what you would expect.
The reason for that is that all markings on the lenses (except wide
open) correspond to optical f/stops (light transmitted through the
lens).
At full aperture, the marking corresponds to the geometrical opening of
the lens. The difference (geometrical vs. optical) can be very low, but
can be as much as 1/2 f/stop on some lenses.
Hope this helps,
Gérard
On Jan 11, 2005, at 6:17 AM, Fernando Gonzalez Gentile wrote:
> Just opened the back of my 28/2.8 but found nothing worth adjusting,
> and
> didn't dare to disassemble further without a little help from my
> friends.
> Fortunately, the lens remains just as before I dared to do so. I do
> love it
> so much.
>
> Fernando.
>
>> From: Fernando Gonzalez Gentile <fgnzalez@xxxxxxxxxxxxx>
>> Subject: [OM] 28/2.8 Was: The (well almost) definitive word on T-32
>> coverage
>>
>> I had observed that when opening the 28/2.8 one stop from 22 to 4,
>> speed
>> moved up, as supposed to, one stop faster (or in Manual, clicking the
>> speed
>> ring towards the next faster speed to keep the needle of my OM-2
>> centered) -
>> *except* when opening up from f4 to f2.8.
>> In this full stop opening, meter showed only a half stop rise.
>> Yes, no matter how much troubleshooting I did.
>> Now I have another OM-2n, and the 28/2.8 behaves the same.
>> It does like this since I bought it new.
>> Does anyone have the same experience? What about the 24/2.8?
>> Suggestions?
>>
>
>
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