RE: Medium format (was: plastic sheets

[Jim MacKenzie <aa279@xxxxxxxxxx>]

On Sun, 6 Jul 1997, Willem-Jan Markerink wrote:

> > 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....

I'm not 100% positive ... I know I have read that many of Nikon's ED 
lenses do not require refocusing.  I looked in my Moose Peterson's Nikon 
System Handbook and that's not the place I read it.

My Nikkors have refocus marks, but they re non-ED.

I could find out.  I have a friend with the 180/2.8.

Jim

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