近代OM-E-system轉接環 與Olympus MA-1(OM FOURTHIRD ADAPTER)之差異?
>the thickness of the OM->4/3 adapter (as measured by Jerzy Wojewoda with a micrometer screw gauge) is 38.67 mm,
>almost 0.1 mm more, well beyond possible experimental error.
>This indicates that OM->4/3 adapter is about 0.1 mm thinner than it should be, and OM lenses on E-series bodies will focus beyond infinity, perhaps a safety measure by Olympus.
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http://www.wrotniak.net/photo/oly-e/any-lens.html