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[OM] changes in optical formula

Subject: [OM] changes in optical formula
From: Joseph Albert <jalbert@xxxxxxx>
Date: Mon, 28 Sep 1998 14:49:19 -0600 (MDT)
Lee writes:

I'd be interested to know the reference for the above claim.  As stated     
in the FAQ (and verified by Oly America), Olympus never redesigned a        
lens to use different elements.  Coatings changed, but not elements.        
                                                                            
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Not according to Vince at Olympus USA.  Call and ask him about the
history of the 300/4.5 and he'll inform you that Olympus doesn't label
their lenses as APO etc. bu they started using ED glass in that lens
at some point.

Another case is the 50/1.8 which went through several renditions of
optical formula, and the 24/2.8 which has versions with different numbers
of elements, or the 85/2 which has both 6 element and 5 element versions.

Purchase of zuiko lenses used is a veritable minefield if you care about
which version of the lens you get, as they are not marked in any way
to determine it.

j. albert

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