Archived posting to the Leica Users Group, 2000/06/05

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Subject: Re: [Leica] spherical aberrations was more d.o.f. with asph?
From: "Bud Cook" <>
Date: Mon, 5 Jun 2000 12:54:46 -0500
References: <v0401171ab560ffd283d2@[]> <>

Here are some possible explanations for good bokeh that I found elsewhere:

- - Radial and tangential aberrations to be about the same.
- - Round diaphragm.
- - No central obstruction (mirror lenses have very unnatural bokeh).
- - Spherical aberration is tolerable and even beneficial.

Spherical aberration seem to be like even harmonic distortion in amplifiers.
It's not irritating and in fact, it can be pleasing.


> "Henning J. Wulff" wrote:>
>             There is a certain truth to this,
>             as the additional spherical aberration
>             that the pre-ASPH Summicron has makes
>             particularly the out-of-focus areas
>             appear softer, broader (and smoother)
>             than the ASPH will render them.
>             [snip]

In reply to: Message from "Henning J. Wulff" <> (Re: [Leica] more d.o.f. with asph?)
Message from Ebert Steele <> (Re: [Leica] spherical aberrations was more d.o.f. with asph?)