Yes, Schaetzl ran interference when I was trying to
buy Denton Taylor's 18/3.5!! I want to move this
particular lens along because it has not been used
except for one trip to the slot canyons of Arizona.
Please see:
http://www.angelfire.com/ca7/xato/fs.html
for photos. Contact me offline for prices, etc.
Warren
<<<<I thought I might recycle an interesting
submission from
the past.
Richard Schaetzl was a list member who always had
something
interesting to say.
>Ladys and gentlemen,
>
>here are some reasons, why you shouldn=B4t sell your
18mm
Zuiko,
>congratulations to the buyer.
>
>Based on a lens test by the Magazin Color Foto,
published
in 9/89,
>11/89.
>
>
>...and the winner is:
>
>Lens Sharpness Contrast Distorsion
> Vignetting
>
> in stops
> Center Corner Total Center Corner Total
>
>Olympus Zuiko Auto-W 18mm 3,5
>3,5 8.4 7,3 8,0 9,0 7,8 8,6 waveform, 2,6
>5,6 8,5 7,6 8,2 9,3 8,1 8,9 slightly to 1,7
>8,0 clear 1,3
>Contax Zeiss Distagon T* 18mm 4,0
>4,0 7,6 6,4 7,2 7,9 6,9 7,6 barrel, 2,3
>5,6 8,7 6,8 8,1 9,0 7,6 8,5 slightly to 1,7
>8,0 clear 1,4
>Leica Elmarit-R 19mm 2,8
>2,8 8,4 5,4 7,4 8,6 6,6 8,0 waveform, 2,6
>5,6 9,2 6,4 8,3 9,3 7,6 8,7 slightly to 1,5
>8,0 clear 1,2
>Nikon Nikkor 18mm 3,5
>3,5 8,0 6,9 7,6 8,5 7,4 8,1 waveform, 2,6
>5,6 8,6 7,2 8,1 9,2 7,9 8,8 slightly to 1,6
>8,0 clear 1,2
>Canon FD 17mm 4,0
>4,0 7,4 6,1 7,0 8,3 6,4 7,7 waveform, 2,3
>5,6 8,1 6,6 7,6 8,9 7,6 8,5 slightly to 1,5
>8,0 clear 1,2
>... and now some realy bad performer.
>
>Vivitar 17mm 3,5
>3,5 6,7 3,1 5,5 6,2 3,6 5,4 waveform, 2,4
>5,6 8,3 4,7 7,1 9,1 6,8 8,3 clear 1,5
>8,0 1,3
>Tokina SL 17mm 3,5
>3,5 7,7 5,4 6,9 7,7 5,2 6,9 waveform, 2,3
>5,6 9,0 6,7 8,2 9,3 7,9 8,8 slightly
to
1,6
>8,0
clear 1,4
>
>If somebody complains, that the test is pretty old
and new
lens designs
>migth be better, to whom I like to tell, that CoFo
tested
recently the new
>18mm 2.8 AF-Nikkor and it showed,that the old 18mm
3,5
Nikkor is slightly
>better. Neither Leitz(Leica) nor Zeiss have changed
there
lens design
>since.
>
>Remarkeble is the high performance of the Zuiko with
wide
open aperture,
>stoping down has not much influence on sharpness and
contrast.
>Interesting is the difference in quality of the
Tokina and
Vivitar lenses,
>as far as I know, they are the same design. I owned
the
Vivitar lens and
>found it a quite decent lens (this means either my
standard for quality
>is low :-( or i got a better lens they send to the
test
:-) or even
>better the Zuiko is supernaturely good =3D8-O ).
>
>The quality numbers are basing on MTF measuring, the
difference of one
>whole number marks an, for the critical observer,
just
noticable
>difference in sharpnes, contrast. The maximum number
is
10, which stands=
for a
>flawless lens. The number are computed and weigthed
for
the central
>half diameter
>to 2/3 and the rest to 1/3, the extrem corners are
not
rated.
>Vignetting is the combined effect of light fall off
and
vignetting
>through the lens barrel.
>Waveform distortion is a combination of pincushion
distorsion in the
>corner and barrel distorsion in the center.
>
>Richard
>
>
>
>
>
>
>
>
>
>
>< This message was delivered via the Olympus Mailing
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>
>< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx
>
>< Web Page:
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- --
Winsor Crosby
Long Beach, California
>>>>>
=====
Warren Xato
For where to go when you know when
-PhotoDates-and-Places@xxxxxxxxxxxxxxx
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