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Re: [OM] Considering switch to Oly

Subject: Re: [OM] Considering switch to Oly
From: "W. J. Liles" <wliles@xxxxxxxxx>
Date: Sat, 22 Jan 2000 12:51:23 -0600
george wrote:
> 
> Yes, I picked up on this 'lack of long APO lenses' too.
> What about the Zuiko 180/2?   250/2?  350/2.8?
> 
> george
> 
> Dirk and Carla Wright wrote:
> >
> > I think that just because the zuiko lenses in this range are not marked
> > "APO" does not mean that they are in fact apochromatic. Also, I think I read
> > on this list a while back that the 300/4.5 has LD glass in it. Olympus is
> > not a company that shouts it's features like many other brands, much to it's
> > disservice.
> >
> > Be seeing you.
> >
> > Dirk Wright
> >

I agree with Dirk.  In "The OM System Lens Handbook" in the glossary
under Chromatic Aberrations they say, "The recently developed, extra
fast, super telephoto lenses make plentiful use of ultra low dispersion
glass and extraordinary partial dispersion glass to reduce these
chromatic aberrations to only about a tenth of the value obtained by
regular optical glasses."  I think that pretty well defines an
apochromatic design.  Indeed the 1000mm F11 is referred to as an
apochromat, but it is called that because it uses a lense design called
a "Schubel, flint apochromat".  That design does not use the new
glasses.  The Zuiko 180 F2.8, 250 F2., 350 F2.8 use the new glasses and
are, I believe, apochromatic even if they are not called apochromats. 
The 300 F4.5 also uses the special glasses and may also be truely an
apochromatic design. 

Again, like Dirk says, Olympus does not shout its features, much to its
disservice.

Jerry Liles

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