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Old Oct 21, 2004, 2:54 PM   #1
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I want the zoom, but will this be enough light?

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Old Oct 21, 2004, 3:32 PM   #2
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Actually, at full zoom it's f/5.6, not f/4.

I own the 20D and this lens. I found the f/4 at wide angle to be sufficient for most purposes, especially considering that the 20D provides a very usable ISO 400 or 800 and even 1600 or 3200 for difficult situations.

However, I do admit that I'd love to have a lens in that FL range that is f/2.8 since that would then be able to utilize the 20D's high precision AF mode.
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