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Re: [OM] Large Aperture Design

Subject: Re: [OM] Large Aperture Design
From: Winsor Crosby <wincros@xxxxxxxxxxxxx>
Date: Tue, 25 May 1999 19:37:14 -0700
Chuck wrote:

>If this is too far OT, slap me.  I'm curious about the design issues in
>
>producing a large aperture lens.  Is it "just" a matter of maximizing
>the
>diameter of the light path and removing any obstructions?  Does
>increasing
>the diameter of the front element lead to a lower f number?  Do the
>laws of
>optics rule out a lens with an aperture larger than f/1.0, or is it at
>least
>theoretically possible to build a 50 mm lens with a 100 mm filter ring
>and
>gather enough light to get to f/0.8 or something?

Before Canon gave up making its version of the Leica M3 it produced an F
0.95 lens.

Winsor

Winsor Crosby
Long Beach, California, USA
mailto:wincros@xxxxxxxxxxx





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