RE: Medium format (was: plastic sheets

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

On  6 Jul 97 at 11:35, Jim MacKenzie wrote:

> On Sun, 6 Jul 1997, Willem-Jan Markerink wrote:
> 
> > Show me a 200'ish handholdable ED lens, and I'll buy it 
> > tomorrow....using it with a Nikon->EOS adaptor of course....8-))
> > Thusfar only non-AF's like Angenieux 180/2.3 (Nikon & Leica mount)
> > and Leica 180/3.4 and 180/2.0 (oefff, too heavy/expensive....but as high end as 
> > one can get!) fit this category.
> 
> AF Nikkor 180mm f/2.8-D IF-ED :-)
> 
> This is one of Nikon's best lenses of all time.

Are you sure it lacks IR-refocus? No red dot on the distance scale, 
*and* no referring in the manual to a certain aperture/DOF setting as 
a replacement indicator?
Not even the Leica 180/2.8 is good enough....hardly any non-APO lens 
is actually, and many APO's even cheap out on including the IR-spectrum.
The use of ED, fluorite, APO or whatever is definately *no* guarantee 
for a perfect IR-focus....simply because there is no real definition 
of performance in this field....


 

- -- 
Bye,

Willem-Jan Markerink


      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]
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