On Gio, 12 mar 1998 0:35, *- DORIS FANG -*
<mailto:sfsttj@xxxxxxxxxxxxxxxxxxx> wrote:
> They did mention the distortion. But let's face it, nobody buys
this
>sort of lens expecting it to excel at copying flat objects AND
>architecture. Even the vaunted 35-80/2.8 Zuiko is described by Pop
Photo
>as: "Distortion was noticeable at 35mm and 80mm, but nominal at 50mm,
>usual for this type of zoom."
> I agree with you that it is a significant problem, but one endemic
to
>most zooms in this range. The Nikon 35-70/2.8 "D" was described by
Pop
>thusly: "Distortion was noticeable but not bad at 35mm & 70mm, aa
usual
>performance for a zoom of this type."
> We tend to forget that zooms involve many serious compromises.
What
>bothered me the most about that OM 35-70/3.5-4.8 was the fall-off.
Too
>much for use with slide film, and it persisted until f/16 (!!!!) @
35mm,
>f/11 @ 50mm, and f/8 @ 70mm. Ouch. I can't believe companies don't
offer a
>corrective filter for lenses like this one. It'd be worth it.
>
When you have to do repro work (a job for which distortion can result
in a complete failure) you can set the zoom at the lenght of zero
distortion, almost every zoom has one. Leica points at this fact
explicitely in its advertising-informations. But of course a zoom is a
zoom. Real zero distortion is found only in macro lenses, and it is
the main reason for using a macro lens, imho. (The second is better
eveness of centre to corners quality, the third is better quality at
1/3 size reproduction ratio, more or less, or even in a full range
ratio from 1/2 to 1/? in IF projects). Macro zoom are rare birds,
Nikon has just made one, the first and only in the world, asfaik.
Marco
mailto:tom@xxxxxxxxxxxx
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