I don't know, it may be a quirk of that lens.
___________________________________
John Hermanson | CPS, Inc.
21 South Ln., Huntington NY 11743
631-424-2121 | www.zuiko.com
Olympus OM Service since 1977
Gallery: www.zuiko.com/album/index.html
Dawid Loubser wrote:
> So what you could be saying, is that the 250/2.0 is really a 250/1.8 for
> focusing :-) Wow :-) Or it's really a 250/2.2...
>
> But before we start making assumptions, I'd really like somebody in
> the know to confirm, or somebody with another 250/2.0 to check
> their lens' behavour.
>
> I'm afraid it'll be difficult for you to extensively test my lens
> which is currently in Johannesburg, South Africa - far, far away from
> you
> I think :-)
>
>
> On 05 May 2010, at 11:38 PM, usher99@xxxxxxx wrote:
>
>> The Zuiko 135 f4.5 macro has this characteristic--very easy to see.
>> Wide open is really F4 for focusing but f4.5 during exposure.
>> If I had a 250 f2 I'd gladly check. I am more than happy to do some
>> extensive testing on your copy to confirm what you say. :-)
>>
>> http://zuserver2.star.ucl.ac.uk/~rwesson/esif/om-sif/lensgroup/135mmf45.htm
>>
>> Mike
>> --
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>
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