The Olympus part is also dished, moving the filter away from the
front element of the lens. Most step up rings don't do this.
Mike
An important consideration if one needs this step-up ring is that
you need the one made by Olympus as those made by others, in my
experience, have threads which are too thick and won't work with the
Olympus lens. Bill "Still Shooting Film Sometimes" Barber
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