whats the difference between these two lenses?

JMS803

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I was looking at these sigmas and I can't tell the difference between the two. Why is one so much more than the other?

[ame=http://www.amazon.com/Sigma-70-300mm-4-5-6-Telephoto-Cameras/dp/B000A0UHXU/ref=sr_1_37?ie=UTF8&s=photo&qid=1235785749&sr=1-37]Amazon.com: Sigma 70-300mm f/4-5.6 DG Macro Telephoto Zoom Lens for Nikon SLR Cameras: Camera & Photo[/ame]

[ame=http://www.amazon.com/Sigma-70-300mm-4-5-6-Telephoto-Cameras/dp/B000A7V2DC/ref=sr_1_61?ie=UTF8&s=photo&qid=1235787090&sr=1-61]Amazon.com: Sigma 70-300mm f/4-5.6 DG APO Macro Telephoto Zoom Lens for Nikon SLR Cameras: Camera & Photo[/ame]
 

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The APO edition (your second link) is the newer of the two lenses and has APO coatings on the glass - this gives it a noticable and good improvement to its sharpness. Considering that these are budget lenses their image quality is always a big compramise - and past 200mm they start to go soft. With APO coatings you get better performance and I would encourage you to go for that lens over the original
 
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JMS803

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oh ok that makes sense I figured the second one had a bit more quality. Thanks guys
 

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