Hi all,
I have an S Zuiko 35-70 f4 zoom with a diaphram that doesn't seem to be
fully opening. The blades are snappy and when I look through the lens,
set at f4, with the zoom set at 70mm I see a circular opening. However
if I set the zoom to the 35mm setting and look through it the diaphram
is shaped like an octagonal. I presume that the aperture blades are not
fully open. Is this normal? If not are there any suggestion as to how
to rectify it?
Tom Murphy
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