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[OM] Large Aperture Design

Subject: [OM] Large Aperture Design
From: "Chuck Castleton" <ccastleton@xxxxxxxxxx>
Date: Mon, 24 May 1999 11:00:37 -0600
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?

Chuck


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