LENSES

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To: List for Photo/Imaging Educators - Professionals - Students<photoforum@listserver.isc.rit.edu>
Subject: LENSES
From: Steve Ross <steveross.effigy@virgin.net>
Date: Wed, 08 Jan 2003 11:50:55 +0000
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Hi

Could someone explain these certain numbers found
around the front elements of a lens: 1:2.8 or 1:3.5 etc.
I know the 2.8 and 3.5 is the lense speed? but whats
the 1:?

Many thanks

Steve.

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