Archived posting to the Leica Users Group, 2001/06/03

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Subject: Re: RE: [Leica] Photodo MTF ratings
From: ShadCat11@aol.com
Date: Sun, 3 Jun 2001 11:57:47 EDT

In a message dated 06/02/2001 3:55:49 PM, you wrote:

<<> If these numbers are to be believed, the 35/1.4 asph actually
excels at the
> smaller f-stops, only bettering the Canon SLR lens at f8.  At
f1.4, the asph
> has a pretty dismal graph on the MTF chart.

I'm not into MTF charts but what has always shown up on the film
with Leica glass, over the years, has "looked like" better
contrast, better edge, more shadow detail. Does anyone quantify
these "appearances" with numbers? Is it possible?>>

That's what intrigues me.  If these things are not quantifiable, then how 
could  lenses with the aforementioned distinctions be designed and 
manufactured?  Surely there must be some "formula" to get that look, and it 
so, why can't other makers duplicate them?  By this time, there can hardly be 
any secrets in the industry.  Can anyway shed some light on this arcana of 
lensistry, please?

Allen Zak