I chanced to look carefully at the parts drawings of the OM 24/2
recently and was surprised to see that there were significant changes to
several lens elements and related parts labeled the "improved parts
table" <http://olympus.dementia.org/Hardware/PDFs/24mm_f2.0.pdf>
But I never recall hearing about there being two versions of the 24/2
nor what serial number ranges might be involved.
Gary Reese's tests of the 24/2 indicated "pronounced waveform"
distortion in his first test sample and "moderate waverform" in what was
presumably a second sample (although that's not explicitly stated as it
is on other lenses). Is it possible the "improved parts" were to
correct that distortion?
Chuck Norcutt
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