On 12 Mar 1998, Marco wrote:
> 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.
Interesting info, Marco, and it makes sense, since most zooms go from
barrel to pincushion, that there would be a point at which it was zero.
Even though I have Macro lenses for the Nikons and OMs, that's good to
know.
> 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.
Vivitar long ago made the legendary Series I 90-180 flat field macro
Zoom. It was enormous, and an f/4.5, and I should have bought one. A good
friend has two in Canon mt (one still new in the box!) and from seeing his
pictures, it's a great optic. Ponderous, slow and heavy, though.
*= Doris Fang =*
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