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Re: [OM] changes in optical formula

Subject: Re: [OM] changes in optical formula
From: John Hermanson <omtech@xxxxxxxxx>
Date: Tue, 29 Sep 1998 10:49:26 -0400
Olympus has definetly changed some lens formulas over the years.  And you
are correct in that you cannot simply replace a regular element with an ED,
or MC.

John

R. Lee Hawkins wrote:

> In your message dated: Mon, 28 Sep 1998 14:49:19 MDT you write:
> >
> >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.
> >
> >======================================================================
> >
> >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.
>
> Interesting, since Vince is the one that told me that they never changed
> their designs once designed.  Also, you can't just substitute an ED
> element that is exactly the same as a non-ED element.  If you use ED
> glass, you have to redesign the entire optical layout of the lens.
>
> I wonder which version of what Vince told us is correct?
>
> Cheers,
> --Lee
>
>




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