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Re: [OM] opinions of short Olympus teles

Subject: Re: [OM] opinions of short Olympus teles
From: Gary Reese <pcacala@xxxxxxxxxxxxx>
Date: Wed, 25 Jul 2001 22:43:33 -0700
Zbigniew writes:

<< According my latest sources on Zuiko lenses, these ones are WITH
floating element design:
18/3,5
21/2,0
24/2,0
28/2,0
90/2,0
100/2,0 >>

Not every source on the Olympus OM System is correct.  You'd be best to
question other "facts" in that particular source.  Sounds like it wasn't
edited well.

Skip W. writes:

<< The surprise to me is that the vaunted 90/2 Macro doesn't have the
floating element correction.  Perhaps it's corrected for close-up
distances already? >>

It does have it, as per my Olympus Sales Information File.

<< But why would the two 50 Macro lenses need such a device?  Are 50's
corrected more for infinity, even in the case of the Macro lenses? >>

"Close focus aberration correction" is a misnomer for the 50mm macros
and the 90mm macro.  They are optimized for 1:10 reproduction, so the
floating elements are, by design, infinity focus aberration correction.
Modern Photography (90mm) and Popular Photography (50mm f/2) tests show
that both have better performance at about 1:50 than at 1:2 - but they
didn't test at 1:10.  Maybe the floating elements don't move between 1:2
and 1:10 ???

The 24mm Shift has internal focus, like the 180mm f/2, 250mm f/2 and
350mm f/2.8, so it can be considered to have "floating elements" also.

Gary Reese
Las Vegas, NV


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