Archived posting to the Leica Users Group, 2000/07/05

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Subject: Re: [Leica] OT: (kind of) Voightlander 90mm?
From: "Ken Iisaka" <>
Date: Wed, 5 Jul 2000 09:01:29 -0700
References: <000d01bfe68c$5e9387c0$> <002501bfe695$d07afd60$>

> Optical sharpness of moderately wide and mild telephoto lenses from
each of
> the cameras is demonstrated by using 36x blowups from a test chart.
> Leica lenses tested were the 28mm Elmarit and the 90mm APO Summicron.
> test frames were shot at f8.  A couple of the shots were spoiled by AF
> operator error (the Contax automation and the Konica's tricky
> Other than those it's...quite frankly...darned near impossible to tell
> lenses apart.  These are measures of sharpness only.  Other more
> lens performance characteristics are not addressed in the article.

At f:8, many lenses are already diffraction-limited.  Leica optics are
particularly so, performing at their best already at f:4 or 5.6.

Replies: Reply from Mark Rabiner <> (Re: [Leica] OT: (kind of) Voightlander 90mm?)
In reply to: Message from "B. D. Colen" <> (RE: [Leica] OT: (kind of) Voightlander 90mm?)
Message from "Craig Roberts" <> (Re: [Leica] OT: (kind of) Voightlander 90mm?)