Archived posting to the Leica Users Group, 1998/01/19

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Subject: Re: [Leica] Why no ASPH teles?
From: Eric Welch <>
Date: Mon, 19 Jan 1998 20:19:03 -0600

At 08:30 AM 1/19/98 +0000, you wrote:

>However I have read that the benefits of aspherical lens elements becomes
>greater with increased focal length, so I am left wondering why in the

I think you are confusing ASPH with APO. The wider (and faster) the lens,
the more it benefits from Aspheric lens elements I would think. Lenses
shorter than 100mm really don't benefit from APO correction that much, so I
read. But the 100 Apo Macro sure is testament to the value of such correction.

Eric Welch
St. Joseph, MO

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