I am lucky enough to have access to two 250mm f2 Zuiko lenses and neither of
them do what you describe. At wide open (f2) there is no movement of the
aperture blades when the DOF preview is pressed. Michael.
-----Original Message-----
From: Dawid Loubser [mailto:dawidl@xxxxxxxxxxx]
Sent: Thursday, 6 May 2010 6:12 AM
To: Olympus Camera Discussion
Subject: [OM] 250mm F2 aperture stops down slightly even wide open?
Hello fellow Zuikoholics,
Could anybody that owns / uses a 250/2.0 please check something for me
on your lens?
I noticed something odd today - when the lens is set wide open, and
you look into it
while pressing the DOF preview or tripping the shutter, the aperture
blades stops down
a little bit (unlike any other OM Zuiko that have used).
I know object scales when looking into a huge piece of glass like this
is deceiving, but
it "appears" as if the aperture closes down by a radius of 5mm
(perhaps less) - a small fraction
when compared to stopping down to f/2.8, but still visible.
I was just curious whether it's a quirk of my lens, or whether this is
normal. The only other
lens I've seen with similar behaviour, at certain focus distances, is
the electronic
Canon EF 100mm f/2.8 Macro, but I know there are others (like the CV
125mm Macro).
regards,
Dawid
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