Bird photography - the most versatile lens?

To: "Mark" <>, <>, "Stewart Ford" <>
Subject: Bird photography - the most versatile lens?
From: "michael hunter" <>
Date: Fri, 20 Aug 2004 11:21:12 +1000
         How do Sigma lenses compare wih Canon. Sigma has a 80-400mm image
stabilised zoom, how does it compare with the Canon 100-400 IS?
         To what magnification can you hand-hold a camera without
significant shake and blurring? ie when do you need a tripod? Are monopods
any good?
          How much magnification can you achieve by blowing up a digital
image from say a 6 megapixel camera and perfect exposure without losing good

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